The Aux Powerguard (Japanese: マルチアップMulti-Up) is a type of battle item introduced in Pokémon Legends: Arceus. It temporarily boosts the offensive and defensive stats of the Pokémon currently in battle.
When used on a Pokémon from the Bag during battle, it sharply raises that Pokémon's the offensive and defensive stats. These effects disappear if the Pokémon leaves the battle.