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Delta Stream
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. 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). Additionally, a mysterious air current causes the weather modifying moves Sunny Day, Rain Dance, Sandstorm, and Hail to fail if used; and causes 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 has its Ability suppressed or replaced, or if the Desolate Land or Primordial Sea Ability activates.
Pokémon
| Pokémon | Type | Ability 1 | Ability 2 | Hidden Ability | |
|---|---|---|---|---|---|
| Mega Rayquaza |  Dragon
|
 Flying
|
Delta Stream | None | None |
