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Delta Stream デルタストリーム
Delta Stream
Flavor text
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.
Generation VIII
Currently unknown

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.



In battle

When a Pokémon with Delta Stream enters the battle or a Pokémon gains the Ability, a unique weather condition called strong winds 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 when that Pokémon is rotated in. In addition, Delta Stream will not activate if strong winds are already present on the battlefield or if the Pokémon's Ability is suppressed prior to it gaining Delta Stream.

Strong winds cause 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.). Strong winds have no effect on Stealth Rock or Anticipation.

Additionally, strong winds cause 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.

Once in effect, as long as there is a Pokémon on the field with the Ability Delta Stream active (even if it is not the Pokémon who created it), the strong winds will remain in effect unless it is replaced. (If the only Pokémon on the field with Delta Stream is rotated out or switched out, or has its Ability suppressed or replaced, the strong winds will dissipate.) The strong winds can be replaced by Desolate Land or Primordial Sea.

Outside of battle

Delta Stream has no effect outside of battle.

Pokémon with Delta Stream

# Pokémon Types First Ability Second Ability Hidden Ability
Rayquaza 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 or later.

In other games


Games Description
SMD The floor will have strong winds!

In the manga

In the Pokémon Adventures manga

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
France Flag.png French Souffle Delta
Germany Flag.png German Delta-Wind
Italy Flag.png Italian Flusso Delta
South Korea Flag.png Korean 델타스트림 Delta Stream
Brazil Flag.png Brazilian Portuguese Corrente Delta
Spain Flag.png Spanish Ráfaga Delta

Variations of the Ability Primordial Sea
Primordial SeaDesolate LandDelta Stream

Project Moves and Abilities logo.png 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.