Once during your turn (before your attack), you may search your discard pile for a Psychic or Metal Energy card and attach it to your Active Pokémon. Then, put 1 damage counter on that Pokémon. This power can't be used if Metagross is affected by a Special Condition.

Link Blast

70

If Metagross and the Defending Pokémon have a different amount of Energy attached to them, this attack's base damage is 40 instead of 70.