As long as Tentacruel has any React Energy cards attached to it, prevent all effects, including damage, done to any of your Tentacruel in play by attacks from your opponent's Pokémon-ex.
Attacks
[Water]Water Arrow
Energy Cost: 1
Choose 1 of your opponent's Pokémon. This attack does 20 damage to that Pokémon. (Don't apply Weakness and Resistance for Benched Pokémon.)
[Colorless, Colorless]Fury Strikes
20×
Energy Cost: 2
Flip 3 coins. This attack does 20 damage times the number of heads.