Delta Stream (Ability)

Desolate Land/Primordial Sea/Delta Stream is in need of spading. See its section on the spading page for more information, and how you can help. When a Pokemon with this Ability is rotated out in a Rotation Battle or has its Ability suppressed or replaced, does the mysterious air current remain or disappear if another Pokemon with this Ability is still on the field?

Delta Stream	デルタストリーム
	Delta Stream
Flavor text Generation III Currently unknown Generation IV Currently unknown Generation V Currently unknown Generation VI Affects weather and eliminates all of the Flying type's weaknesses. Generation VII The Pokémon changes the weather to eliminate 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.

Effect

In battle

When a Pokémon with Delta Stream enters the battle or a Pokémon gains the Ability, a unique weather condition called mysterious air current is created. 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 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 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

#	Pokémon	Types		First Ability	Second Ability	Hidden Ability
	Rayquaza Mega Rayquaza	Dragon	Flying	Delta Stream	None	None
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.

In other languages

Language Title Chinese Cantonese 德爾塔氣流 Dākyíhtaap Heilàuh Mandarin 德爾塔氣流 / 德尔塔气流 Dé'ěrtǎ Qìliú French Souffle Delta German Delta-Wind Italian Flusso Delta Korean 델타스트림 Delta Stream Brazilian Portuguese Corrente Delta Spanish Ráfaga Delta

This article is part of Project Moves and Abilities, a Bulbapedia project that aims to write comprehensive articles on two related aspects of the Pokémon games.