When Pokémon-ex has been Knocked Out, your opponent takes 2 Prize cards.
As long as Rocket's Entei ex has any Energy attached to it, Rocket's Entei ex has no Weakness.
Search your discard pile for an Energy card and attach it to Rocket's Entei ex.
Discard 2 Energy attached to Rocket's Entei ex and then choose 1 of your opponent's Pokémon. This attack does 60 damage to that Pokémon. (Don't apply Weakness and Resistance for Benched Pokémon.)