Name: Nimbus Terrain
Type: Flying
Message: "Nimbus Clouds covered the battlefield"
Metallic Surge: Swellow
Z Move: Speed +1
Nature Power: Air Slash
Secret Power: Brave Bird animation; 30% chance to raise Speed by one stage
Effect 1: Flying-type moves from airborne Pokémon gain 50% power.
Effect 2: Normal-type moves from airborne Pokémon become Flying-type.
Learned by: Pidgey, Pidgeotto, Pidgeot, Spearow, Fearow, Doduo, Dodrio, Articuno, Zapdos, Moltres, Dragonite, Togetic, Lugia, Ho-Oh, Taillow, Swellow, Swablu, Altaria, Salamence, Rayquaza, Togekiss, Shaymin, Sigilyph, Ducklett, Swanna, Tornadus, Thundurus, Landorus, Fletchling, Fletchinder, Talonflame, Noibat, Noivern.
Seed: Nimbus Seed
Seed Effect: Speed +1
Competitive Use: Altaria itself is rather mediocre even with the terrain, but it can support the likes of Dragonite, Landorus-T, and Noivern and make them absolute menaces.
Name: Deep Concentration
Pokémon: Meditite & Medicham, Riolu & Lucario (over Inner Focus), Gallade, Cobalion, Terrakion, Virizion, Keldeo.
Description: The user gets stronger under Chakra Terrain by increasing their focus.
Effect: When under Chakra Terrain, always gets a critical hit with Fighting- or Psychic-type moves.
Competitive Use: Fighting spam?
Name: Piercing Cold
Pokémon: Snorunt & Glalie (over Inner Focus), Glaceon, Froslass
Description: The user makes use of the Frosty Terrain beneath it to release Ice-type moves capable of denting even the sturdiest of Pokémon.
Effect: When under Frosty Terrain, user's Ice-type moves deal double damage to any Fire-, Water-, Steel-type or any Pokémon with Thick Fat.
Competitive Use: Makes Glaceon impossible to switch into, but the again, getting the proper terrain support by stacking Stealth Rock weakness and being outsped and revenge killed by virtually anything makes this strategy rather unappealling.
Name: Leafy Shield
Pokémon: Chikorita, Bayleaf, & Meganium (Over Leaf Guard), Leafeon
Description: The user makes use of the Grassy Terrain beneath it to protect itself from Super Effective moves.
Effect: When under Grassy Terrain, The user takes half damage from Bug-, Fire-, Ice-, Flying-, and Poison-type moves.
Competitive Use: Make Meganium and Leafeon good? They can definately last a couple more turns without weaknesses.