Flash (move)

Flash (Japanese: フラッシュ Flash) is a non-damaging move introduced in Generation I. In Generations through, it was HM05, and in Generations  through , it was TM70.

Generations I to III
Flash decreases the target's stat by one stage.

The accuracy of Flash is 70% in these generations.

Generation IV onward
The accuracy of Flash changed to 100%.

If powered up by a Normalium Z into Z-Flash, the user's is raised by one stage.

Generations I to II
Flash will illuminate dark caves. The effect will last until the player exits the cave. When the player re-enters the cave, it will be dark again.

Generations III to V
Flash will only illuminate a large circle around the player to increase visibility in caves.

In, Pokémon Diamond and Pearl and , it will light up the entire screen like it did in Generation I.

Generation VI
In Pokémon X and Y, as there are no dark caves to be found, Flash will instead cause the screen to zoom out, revealing more of the surrounding area than normally is visible. In addition, it also decreases the chance of encountering wild Pokémon.

In Pokémon Omega Ruby and Alpha Sapphire, dark areas where Flash can be used to light up the surroundings are present once again. However, in this game the dark areas are shown to be more dimly lit rather than completely dark, making the move less needed than before.

Generation VII
Flash is no longer usable outside of battle. In Pokémon: Let's Go, Pikachu! and Let's Go, Eevee!, the player can use Secret Technique Light Up instead.

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Trivia

 * Flash is never required to advance gameplay, as darkened caves are still navigable without the move.

In other languages
Blitz Destello Flash Flash フラッシュ 闪光（招式）