From Bulbapedia, the community-driven Pokémon encyclopedia.
Wide Slash is a typeless move introduced in Pokémon Mystery Dungeon that inflicts damage in three different directions. In the English version of Pokémon Mystery Dungeon, it was known as Horizontal Cut, although it was called Wide Slash in the sequel. It is only one of two attacks (the other being Vacuum-Cut) which are exclusive to the Mystery Dungeon series. Because of this, no Pokémon learn Wide Slash by level-up, although a large number may learn the move by TM.
Wide Slash will attack foes on the three tiles diagonally to and in front of the player. It will miss against frozen opponents, and is affected by the Taunted status, and its power can be raised through Ginseng. It has a base 12% critical.
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