If the target of this move is holding an item, then the target will lose the item and the power of the move is increased by 50%. The item cannot be recovered with Recycle
If the Pokémon is holding an item that cannot be removed, such as Giratina with the Griseous Orb, Arceus holding any of its plates or a Pokémon who is holding a Mega Stone needed for it to Mega Evolve, then the move will not do extra damage and they will not lose the hold item.
If the user is knocked out from recoil caused by the opponent's hold item or ability, then the opponent will keep the hold item.
If the target has got the Sticky Hold ability, the damage will be increased, but the opponent will not lose the hold item.