This attack does 10 damage for each Pokémon in your discard pile that has the United Wings attack to 1 of your opponent's Benched Pokémon. (Don't apply Weakness and Resistance for Benched Pokémon.)
Speed Wing is an attack that first appeared on Latios from Dragon Vault. The United Thunder attack's name and effect refers to the United Wings attack, first seen on a card of Kilowattrel's prevolution, Wattrel from Paldea Evolved. (The Wattrel card was released before the other two Paldea Evolved cards with United Wings, Murkrow and Flamigo, in Japanese sets, as part of Triplet Beat.) This card's Pokédex entry comes from Pokémon Scarlet.