• Amnesia

  20

  Choose 1 of your opponent's Active Pokémon's attacks. That Pokémon can't use that attack during your opponent's next turn.

• Swim

  90

  If any of your opponent's Pokémon have any Water Energy attached to them, you may do 90 damage to 1 of your opponent's Benched Pokémon instead of their Active Pokémon.(Don't apply Weakness and Resistance for Benched Pokémon.)

Even fast-swimming fish Pokémon can be disabled by Golduck. It brings them to a standstill and seizes them.