As long as Kyogre ex has 1 Energy or less attached to it, the Retreat Cost for each of your Kyogre ex is 0.
[W][W][C] Hydro Shot
Discard 2 Energy attached to Kyogre ex. Choose 1 of your opponent’s Pokémon. This attack does 70 damage to that Pokémon. (Don’t apply Weakness and Resistance for Benched Pokémon.)
When Pokémon-ex has been Knocked Out, your opponent takes 2 Prize cards.