Each entry applies for both games and for all three Starter Pokémon unless otherwise noted.
Abomasite
General Location: Route 123
Story Requirements: Must have battled Groudon/Kyogre and received the National Dex.
Specific Location: The Berry Fields on Route 123 – Go in the Berry Fields, follow the main path on the right side of the screen, all the way to the back of the field where the Abomasite awaits.
Absolite
General Location: Safari Zone
Story Requirements: None.
Move/Item Requirements: Acro Bike required.
Specific Location: Safari Zone, Area A (the top left part). When you enter the Safari Zone, go all the way to the far bottom left. You’ll find stones you can jump on with the Acro Bike. Jump on these stones, and then go on a bridge with the Acro Bike. On this bridge you’ll see another bridge to the left you can jump onto. Jump onto this bridge, follow it and then you’ll be forced to jump onto a 3rd bridge. Follow this 3rd bridge to a plateau where the Absolite is.
Aerodactylite
General Location: Meteor Falls
Story Requirements: Must have battled Groudon/Kyogre and received the National Dex, and, must have defeated Wallace and received the 8th badge.
Move/Item Requirements: HM03 Surf, HM05 Waterfall
Specific Location: Meteor Falls. Surf, go up the Waterfall, go into the back room. Go to the right side of the room, go down a staircase. You'll know you're going the right way if you pass by a Battle Girl. Go down to the level below that, go over the staircase on the other side of the room back upstairs (passing by a Dragon Tamer), pass by an old couple, go up the stairs to the top of the room, go down the ledges, but stay on the left side of the screen (left from your perspective, closest to the old couple). On the last ledge before you reach the bottom is the Aerodactylite, next to two small stalagmites.
Aggronite
General Location: Rusturf Tunnel
Story Requirements: Must have defeated Wattson and gotten the 3rd badge.
Move/Item Requirements: HM06 Rock Smash
Specific Location: Rusturf Tunnel. Smash the rocks blocking the path. As a reward, Wanda's boyfriend gives you the Aggronite.
Alakazite
General Location: Slateport City
Story Requirements: None.
Specific Location: Slateport City, Slateport Market - the Alakazite is in the bottom left of the Market.
Altarianite
General Location: Lilycove City
Story Requirements: None.
Pokémon Required: Altaria must be in your party.
Specific Location: Lilycove City, the Pokémon Contest Spectacular Fanclub house on the east side of the city. Talk to a guy standing out front, he'll ask what Lisia's favorite Pokémon is; show him Altaria and he'll give you the Altarianite.
Ampharosite
General Location: New Mauville (Route 110)
Story Requirements: Must have battled Groudon/Kyogre and received the National Dex.
Move/Item Requirements: HM03 Surf
Specific Location: New Mauville. Wattson standing in the center of Mauville City. Talk to him and he will ask you to investigate New Mauville. Surf there on Route 110. The Ampharosite is in the bottom right corner of the back room.
Audinite
General Location: Battle Resort
Story Requirements: Must beat the post-game Delta Episode and receive the S.S. Ticket.
Specific Location: Battle Resort. First, find Looker on the beach and talk to him. A woman will escort Looker to his cottage. Then, go to Looker's cottage, which is above the water near the Battle Maison. Talk to Looker again and he will give you the Audinite.
Banettite
General Location: Mt. Pyre
Story Requirements: None.
Specific Location: Mt. Pyre, the summit. At the bottom of the first staircase on the summit, where you fought a Team Aqua/Team Magma Grunt, follow the path heading to the right (east) to find the Banettite.
Beedrillite
General Location: Sea Mauville
Story Requirements: Must have defeated Tate and Liza and received the 7th badge.
Move/Item Requirements: HM03 Surf, HM07 Dive
Specific Location: Sea Mauville, Storage Room. Enter Sea Mauville and use Dive inside in the ship, then come back up on the other side. Talk to the little tuber girl to receive the Key to Room 1. Go to Room 1 and find the Key to Room 2. Go to Room 2 and receive the Key to Room 6. Go to Room 6 and go out through the back door. Go surf to the fisherman standing on the small island next to the ship; talk to him to receive the Key to Room 4. Go to Room 4 where you will find the Storage Key. Go back out behind Room 6 to the back of the ship where the fisherman is; this is where the Storage Room is. Open the Storage Room and the Beedrillnite is inside.
Blastoisinite
General Location: S.S. Tidal
Story Requirements: Finish the post-game Delta Episode and receive the S.S. Ticket.
Specific Location: S.S. Tidal, on the northern part of the deck of the ship. NOTE: You can only explore the S.S. Tidal on trips from Slateport City to Lilycove City or vice-versa. Trips to and from the Battle Resort don't allow you to explore the ship.
Blazikenite
If Torchic was your starter:
General Location: Route 120
Story Requirements: None - available as soon as you reach Route 120. Note: You receive this as part of the story.
Specific Location: Route 120, the first bridge. Talk to Steven; he'll give you the Blazikenite.
If Treecko or Mudkip was your starter:
General Location: Route 114
Story Requirements: Defeat Groudon/Kyogre.
Specific Location: Route 114, next to the lake. An old man sitting on the ground offers to sell you a stone called "Fading Fire" for 1,500 P; this is the Blazikenite.
Cameruptite
In Omega Ruby:
General Location: Team Magma Hideout
Story Requirements: Note: You receive this as part of the story. During the Delta Episode, after taking the meteorite shards to the Mossdeep Space Center, go to the Team Magma Hideout as prompted.
Move/Item Requirements: HM03 Surf (to reach the Magma Hideout)
Specific Location: Team Magma Hideout, Maxie's room. You will have to navigate the warp panels to get to Maxie's room. Zinnia steals Maxie's Key Stone, and Maxie gives you the Cameruptite.
In Alpha Sapphire:
General Location: Battle Resort
Story Requirements: Finish the post-game Delta Episode and receive the S.S. Ticket.
Specific Location: Battle Resort. As soon as you disembark the S.S. Tidal at the Battle Resort, Team Magma comes up to you; Maxie gives you the Cameruptite.
Charizardite X
General Location: Fiery Path
Story Requirements: Must have battled Groudon/Kyogre and received the National Dex.
Move/Item Requirements: HM04 Strength
Specific Location: Fiery Path, the area blocked off by boulders. Push the first 2 boulders aside with Strength. Then, follow the path all the way to its southern end, where the Charizardite X awaits.
Charizardite Y
General Location: Scorched Slab
Story Requirements: Must have battled Groudon/Kyogre and received the National Dex.
Move/Item Requirements: HM03 Surf, HM04 Strength. TM70 Flash is not required but is helpful.
Specific Location: Scorched Slab, B2F (the 3rd level down.) The Charizardite Y will be in the bottom left corner of the floor.
Diancite
General Location: any Pokémon Center
Story Requirements: Must have received Pokédex and be able to trade/use Pokémon Bank (to receive Diancie)
Pokémon Required: Diancie must be in your party.
Specific Location: enter any Pokémon Center with Diancie, and a boy will give you the Diancite.
Galladite
General Location: Fallarbor Town
Story Requirements: Finish the post-game Delta Episode.
Specific Location: Fallarbor Town, Professor Cozmo's Labatory. Talk to Cozmo to receive the Galladite.
Garchompite
General Location: Fortree City.
Story Requirements: None.
Gameplay Requirements: Reach Platinum Rank at the Secret Base Guild (collect 1,000 flags)
Specific Location: After doing the above, talk to Aarune at the Secret Base Guild to receive the Garchompite.
Gardevoirite
General Location: Verdanturf Town
Story Requirements: Must have battled Groudon/Kyogre and received the National Dex.
Specific Location: Verdanturf Town, Wanda's house. Talk to Wanda to receive the Gardevoirite.
Gengarite:
General Location: Battle Resort
Story Requirements: Must beat the post-game Delta Episode and receive the S.S. Ticket.
Specific Location: Battle Resort. The Gengarite is in an old man's house on the beach very close to the water. The house is next to an umbrella and a chair, and has many items in it.
Glalitite
General Location: Shoal Cave
Story Requirements: None.
Move/Item Requirements: HM03 Surf
Specific Location: Shoal Cave, the Ice Cavern, on the plateau. You will have to navigate the icy floor to reach the plateau. NOTE: The Ice Cavern room is only available during Low Tide (3 AM-9 AM and 3 PM-9 PM). It's not available during High Tide.
Gyaradosite
General Location: Route 123
Story Requirements: None.
Move/Item Requirements: HM01 Cut, HM03 Surf
Specific Location: Route 123, 123 Go Fish. 123 Go Fish is a small house on Route 123. You will have to access to Route 123 from the Mt. Pyre side. You need to Cut down the trees on the northern part of the route and follow that path. Always stay as far north as possible. When you reach the house, talk to the man at the counter and the Poochyena; scratch the Poochyena and you will receive the Gyaradosite.
Houndoomite
General Location: Lavaridge Town
Story Requirements: Must have battled Groudon/Kyogre and received the National Dex.
Specific Location: Lavaridge Town, right near the sand baths behind the Gym.
Heracronite
General Location: Route 127
Story Requirements: None.
Move/Item Requirement: HM03 Surf.
Specific Location: Route 127, an island in the southeast near a Black Belt.
Kangaskhanite
General Location: Pacifidlog Town
Story Requirements: Must have battled Groudon/Kyogre and received the National Dex.
Move/Item Requirements: HM03 Surf.
Specific Location: Pacifidlog Town, next to the Pokémon Center. You will have to Surf behind the Pokémon Center to get it.
Latiasite
In Omega Ruby:
General Location: Littleroot Town
Story Requirements: Finish the post-game Delta Episode.
Specific Location: Littleroot Town, your house. After finishing the Delta Episode, talk to your mother and she will give you the Latiasite.
In Alpha Sapphire:
General Location: Southern Island
Story Requirements: Note: You receive this as part of the story. Beat Norman and get the 5th badge, get Surf, go to Route 118, go with Steven to Southern Island, and acquire Latias.
Move/Item Requirements: HM03 Surf (to cross the water on Route 118)
Specific Location: Southern Island. The Latias that joins your team will hold the Latiasite.
Latiosite
In Omega Ruby:
General Location: Southern Island
Story Requirements: Note: You receive this as part of the story. Beat Norman and get the 5th badge, get Surf, go to Route 118, go with Steven to Southern Island, and acquire Latios.
Move/Item Requirements: HM03 Surf (to cross the water on Route 118)
Specific Location: Southern Island. The Latios that joins your team will hold the Latiosite.
In Alpha Sapphire:
General Location: Littleroot Town
Story Requirements: Finish the post-game Delta Episode.
Specific Location: Littleroot Town, your house. After finishing the Delta Episode, talk to your mother and she will give you the Latiosite.
Lopunnite
General Location: Mauville Hills
Story Requirements: Must have battled Groudon/Kyogre and received the National Dex.
Specific Location: Mauville Hills. Mauville Hills is an apartment complex on the 2nd floor of Mauville City. Wattson will be standing in the center of Mauville City. Talk to him and he will ask you to investigate New Mauville. He will return to his apartment in Mauville Hills. Find the elevators to Mauville Hills and board one them. Head to the eastern part of Mauville Hills, specifically apartment 12. A man in black wearing shades will hassle one of the tenants about rent; after this conversation is done, talk to this man again to receive the Lopunnite.
Lucarionite
General Location: Any Contest Hall
Story Requirements: None.
Gameplay Requirements: Win the Master Rank Contest in all 5 categories, then challenge a Master Rank contest in any category; Lisia will compete in this 6th contest and you must defeat her.
Specific Location: Any Contest Hall. Do all of the above and Chaz (Lisia's rival) gives you the Lucarionite.
Manectite
General Location: Route 110
Story Requirements: Must have obtained a Bike from Rydel's Cycles.
Move/Item Requirements: Mach or Acro Bike required.
Specific Location: Route 110, Cycling Road. Just as you get off the north end of Cycling Road (near Mauville City), there is a small path leading east from Cycling Road, one trainer and a Manectite are at the end of this path.
Mawilite
General Location: Verdanturf Town
Story Requirements: None.
Specific Location: Verdanturf Town. The Mawilite is in a small, secluded path at the south end part of town that is only accessible via the southern part of Route 117.
Mewtwonite X
General Location: Littleroot Town
Story Requirements: Must have battled Groudon/Kyogre and received the National Dex.
Specific Location: Littleroot Town, outside. After you get the National Dex, the Mewtwonite X will be next to Professor Birch's laboratory.
Mewtwonite Y
General Location: Pokémon League (Ever Grande City)
Story Requirements: Must have battled Groudon/Kyogre and received the National Dex. Must have all 8 badges.
Specific Location: Ever Grande City, next to the Pokémon League building.
Pidgeotite
General Location: Verdanturf Town/Rustboro City*
Story Requirements: None - available as soon as you reach Verdanturf Town.
Specific Location: Verdanturf Town. A little girl in town will have lost her Shroomish. Go look behind the sign in Verdanturf Town to find the Shroomish. As a reward, the girl gives you an item called the Intriguing Stone. Go to the Devon Corp. building in Rustboro City and talk to President Stone; he will reveal that the Intriguing Stone is actually the Pidgeotite.
Pinsirite
General Location: Route 124
Story Requirements: Must have defeated Tate and Liza and received the 7th badge
Move/Item Requirements: HM03 Surf, HM07 Dive
Specific Location: Route 124. Go look a Dive spot in the southeast part of the island, past a Sis and Bro pair of trainers. Go down this Dive spot, and follow the trench to a surfacing spot in the middle of the trench. Surface, and go north to an island where the Pinsirite is.
Sablenite
General Location: Sootopolis City
Story Requirements: None.
Move/Items Required: HM03 - Surf
Specific Location: Sootopolis City, on the east side of the city. Go on the bridge to the Cave of Origin from the west side of the city, go across the island to the east side of the city, which leads to the area where the Sablenite is.
Salamencite
General Location: Meteor Falls
Story Requirements: Finish the post-game Delta Episode.
Specific Location: Meteor Falls, the entrance area. After finishing the Delta Episode, go to Meteor Falls and speak to the old woman (the Draconid Elder); she will give you the Salamencite.
Sceptilite
If Treecko was your starter:
General Location: Route 120
Story Requirements: None - available as soon as you reach Route 120. Note: You receive this as part of the story.
Specific Location: Route 120, the first bridge. Talk to Steven; he'll give you the Sceptilite.
If Torchic or Mudkip was your starter:
General Location: Route 114
Story Requirements: Defeat Groudon/Kyogre.
Specific Location: Route 114, next to the lake. An old man sitting on the ground offers to sell you a stone called "Withered Tree" for 1,500 P; this is the Sceptilite.
Scizorite
General Location: Petalburg Woods
Story Requirements: Must have battled Groudon/Kyogre and received the National Dex.
Move/Item Requirements: HM01 Cut
Specific Location: The northeast part of Petalburg Woods that requires Cut to access. The Scizorite is below the ledge where Moss Rock is.
Sharpedonite
In Omega Ruby:
General Location: Battle Resort
Story Requirements: Finish the post-game Delta Episode and receive the S.S. Ticket.
Specific Location: Battle Resort. As soon as you disembark the S.S. Tidal at the Battle Resort, Team Aqua will come up to you; Archie gives you the Sharpedonite.
In Alpha Sapphire:
General Location: Team Aqua Hideout
Story Requirements: Note: You receive this as part of the story. During the Delta Episode, after taking the meteorite shards to the Mossdeep Space Center, go to the Team Aqua Hideout as prompted.
Move/Item Requirements: HM03 Surf (to reach the Aqua Hideout)
Specific Location: Team Aqua Hideout, Archie's room. You will have to navigate the warp panels to get to Archie's room. Zinnia steals Archie's Key Stone, and Archie gives you the Sharpedonite.
Steelixite
General Location: Granite Cave
Story Requirements: Must have obtained a Bike from Rydel's Cycles.
Move/Item Requirements: Mach Bike required. TM70 Flash is not required but is helpful.
Specific Location: Granite Cave, B2F. Go up the slope on the first floor, down a slope then down to B1F, then up the nearest slope, follow the path to a ladder down to B2F, then pass by a Ruin Maniac, and the Steelixite will be on a small plateau near TM65 Shadow Claw.
Swampertite
If Mudkip was your starter:
General Location: Route 120
Story Requirements: None - available as soon as you reach Route 120. Note: You receive this as part of the story.
Specific Location: Route 120, the first bridge. Talk to Steven; he'll give you the Swampertite.
If Treecko or Torchic was your starter:
General Location: Route 114
Story Requirements: Defeat Groudon/Kyogre.
Specific Location: Route 114, next to the lake. An old man sitting on the ground offers to sell you a stone called "Ebb Tide" for 1,500 P; this is the Swampertite.
Tyranitarite
General Location: Jagged Pass
Story Requirements: Must have battled Groudon/Kyogre and received the National Dex.
Specific Location: Head as far east (to the right side of the screen) as you can go, then keep jumping down ledges, sticking as far to the right as you can, until you see a bright green patch of grass near the bottom, which the Tyranitarite is right next to.
Venusaurite
General Location: Route 119
Story Requirements: Must have battled Groudon/Kyogre and received the National Dex.
Specific Location: Route 119, in one of the open patches in the tall grass near the southern end of the route.
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Mega-Evolving Rayquaza and Primal Reversion of Groudon and Kyogre
Red Orb: (Must be held by Groudon to achieve Primal Reversion)
In Omega Ruby:
General Location: Sootopolis City.
Story Requirements: Note: You receive this as part of the story. Battle Groudon.
Specific Location: Sootopolis City, outside the Cave of Origin. After battling Groudon, Maxie gives you the Red Orb.
In Alpha Sapphire:
General Location: Mt. Pyre
Story Requirements: Note: You receive this as part of the story. Defeat Matt on Mt. Pyre.
Specific Location: Mt. Pyre, the summit. After defeating Matt, Team Aqua escapes; the elderly caretakers give you the Red Orb.
Blue Orb: (Must be held by Kyogre to achieve Primal Reversion)
In Omega Ruby:
General Location: Mt. Pyre
Story Requirements: Note: You receive this as part of the story. Defeat Courtney on Mt. Pyre.
Specific Location: Mt. Pyre, the summit. After defeating Courtney, Team Magma escapes; the elderly caretakers give you the Blue Orb.
In Alpha Sapphire:
General Location: Sootopolis City.
Story Requirements: Note: You receive this as part of the story. Battle Kyogre.
Specific Location: Sootopolis City, outside the Cave of Origin. After battling Kyogre, Archie gives you the Blue Orb.
Mega-Evolving Rayquaza
Rayquaza does not need to hold a Mega Stone to Mega Evolve. Rayquaza must know the move Dragon Ascent to Mega Evolve. The Rayquaza you catch during Delta Episode is taught Dragon Ascent by Zinnia. If your Rayquaza does not know Dragon Ascent, the old woman (the Draconid Elder) teach it Dragon Ascent, after finishing the Delta Episode. She can be found in the main room of Meteor Falls. As long as it knows Dragon Ascent, Rayquaza can hold any item and Mega Evolve, such as Life Orb, Leftovers, Choice Band, etc.