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| Delta Stream
| Delta Stream
| Generation VI
| Affects weather and eliminates all of the Flying type's weaknesses.
Delta Stream (Japanese: デルタストリーム Delta Stream) is an Ability introduced in Generation VI. It is the signature Ability of Mega Rayquaza.
When a Pokémon with Delta Stream enters the battle or a Pokémon gains the Ability Delta Stream, the Ability creates a mysterious air current, a unique weather condition. In a Rotation Battle, Delta Stream will not activate if the Pokémon is sent out in a rotated-out position, nor will it activate if the Pokémon is rotated in. In addition, Delta Stream will not activate if a mysterious air current is already present on the battlefield or if the Pokémon's Ability is suppressed prior to it gaining Delta Stream.
A mysterious air current causes moves that would be super effective against pure Flying-type Pokémon to instead deal neutral damage to all Flying-type Pokémon (unless a Pokémon on the field has the Air Lock or Cloud Nine Ability). Outside of Inverse Battles, this causes Electric-, Ice-, and Rock-type moves to deal neutral damage to Flying-type Pokémon; during Inverse Battles, this causes Bug-, Fighting-, Grass-, and Ground-type moves to deal neutral damage to Flying-type Pokémon. If a move is not super effective against the Pokémon's other type (for dual-typed Pokémon), this no longer counts as a super effective hit (for the purposes of damage-reducing Berries, etc.). A mysterious air current has no effect on Stealth Rock or Anticipation.
Additionally, a mysterious air current causes the weather modifying moves Sunny Day, Rain Dance, Sandstorm, and Hail to fail if used; and cause the Abilities Drought, Drizzle, Sand Stream, and Snow Warning to fail to activate.
The mysterious air current will dissipate if the Pokémon is removed from the field (and no other Pokémon with Delta Stream remain on the field), if the Pokémon is rotated out in a Rotation Battle, if the Pokémon has its Ability suppressed or replaced, or if the Desolate Land or Primordial Sea Ability activates.
Outside of battle
Delta Stream has no effect outside of battle.
Pokémon with Delta Stream
|| First Ability
|| Second Ability
|| Hidden Ability
|| Delta Stream
| Please note that this is only 100% accurate to Generation VII games.
- For Generation III games, ignore Abilities introduced in Generation IV or later and Hidden Abilities.
- For Generation IV games, ignore Hidden Abilities.
- For Generation V games, ignore Abilities introduced in Generation VI or later.
- For Generation VI games, ignore Abilities introduced in Generation VII.
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