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.
Bastiodon's body glows metallic as an opponent attacks it and it opens its mouth, forming a white ball in front of its mouth. The ball absorbs the attack and Bastiodon fires the white ball at the opponent.
Bastiodon jumps in front of an attack and lets itself get hit with it while standing its ground. As the attack hits it, it raises its head slightly, releasing a powerful pulse of energy from its face outward. The pulse is the opponent's attack, and it is sent back with double the power.