Metal Burst returns 1.5 times the damage dealt by the foe's last attack. Unlike Counter or Mirror Coat, Metal Burst does not require specifically physical or special damage sources and Metal Burst does not have decreased priority; if the user acts before it is hit by an opponent's damaging move, Metal Burst will fail. The move also fails if the user's substitute is hit instead. In battles involving multiple Pokémon, Metal Burst will hit the last opponent that dealt damage to the user, even if that opponent is not adjacent to the user; Metal Burst cannot affect allied Pokémon.
The user retaliates with much greater force against the opponent that last inflicted damage on it.