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Lowers the target's accuracy one stage. When used in-game, Flash will illuminate dark caves. The effect will last until the player exits the cave and then reset when the player enters the cave again.
Flash has little to no competitive use. Using moves that affect accuracy is an ineffective strategy since many players switch their Pokemon out often, resetting the accuracy boosts.
Sand-Attack is a Ground-type equivalent.
Kinesis is a Psychic-type equivalent.
SmokeScreen is a Normal-type equivalent.