More perhaps viable sets
Latios
Item: Choice Specs
Ability: Levitate
Nature: Timid
EVs: 252 SpA, 252 Spd, 4 Spdef
- Psyshock
- Hidden Power Fire/Thunderbolt
- Trick
- Draco Meteor
Ok, I guess that although I mentioned this pokemon in the OP, I didn't explain it. So, Psyshock is a great STAB move that breaks through special walls, most notably blissey. Despite the -10 BP drop, it still is nonetheless a great move. HP Fire covers steel types, that Latios would normally be walled against. Under normal circumstances, this may not be an awesome move, but with specs, it has a decent boost in its power. Thunderbolt can also be a viable option that can still hit steel types neutrally. Trick is a very notable move here, as it can potentially stop a physical sweeper from doing much in terms of damage. Draco Meteor is Latios's most powerful move, and is 195 BP with STAB, which is pretty powerful.
Calcs:
252 SpA Choice Specs Latios Psyshock vs. 252 HP / 0 Def Mega Venusaur: 330-390 (90.6 - 107.1%) -- 43.8% chance to OHKO
252 SpA Choice Specs Latios Draco Meteor vs. 252 HP / 252+ SpD Latias: 384-452 (105.4 - 124.1%) -- guaranteed OHKO
252 SpA Choice Specs Latios Hidden Power Fire vs. 252 HP / 4 SpD Ferrothorn: 344-408 (97.7 - 115.9%) -- 87.5% chance to OHKO
252 SpA Choice Specs Latios Draco Meteor vs. 252 HP / 0 SpD Hippowdon: 417-492 (99.2 - 117.1%) -- 93.8% chance to OHKO
252 SpA Choice Specs Latios Thunderbolt vs. 252 HP / 252 SpD Assault Vest Slowbro: 180-212 (45.6 - 53.8%) -- 41.8% chance to 2HKO
I can't believe it's not
butter sorcery!
Metagross
Item: Choice Band
Ability: Clear Body
Nature: Adamant
EVs: 252 Atk, 162 HP, 92 Spd
- Meteor Mash
- Bullet Punch
- Hammer Arm/Ice Punch/Earthquake
- Zen Headbutt/Pursuit
Although not packing a bullet punch as strong as Scizor's, Metagross certainly deserves a mention as a choice band user. One trait that Metagross packs is decent bulk, with 80/130/90 defenses. This gives Metagross the chance to stay on the field longer. STAB Meteor Mash has 150 BP, making it the strongest move that Metagross has that he can use effectively. Bullet Punch can be used as Scizor uses it, or it can be used to finish off opponents. Hammer Arm covers other Steel Types, but it draws back Speed, which can be a problem for Metagross, outspeeding other Base 70s. Ice Punch can cover Dragon/Flying Types, which is always nice. Earthquake gives coverage, and is a good alternative to Hammer Arm, not lowering speed. However, Hammer Arm covers Dark Types, that Earthquake doesn't, especially now that steel doesn't resist dark anymore. Zen Headbutt is great STAB move that has a nice chance to flinch, but Pursuit can help trap a switching opponent sensing a Bullet Punch.
I want to add these to the OP, but I want to hear everyone's opinions first. :]