Dark Omastar 19

Card details

HP 70 · Water · Weakness Grass ×2

• Prehistoric Water — If your opponent has any evolved Pokémon in play, choose 1 of them and flip a coin. If heads, your opponent takes the highest Stage Evolution card on that Pokémon and shuffles it into his or her deck.
• Dark Tentacle 30 — During your opponent's next turn, the Defending Pokémon can't evolve except from effects of attacks or Pokémon Powers. (Benching that Pokémon ends this effect.)

“Nothing can escape once wrapped in its tentacles, which it uses for self-defense as well as to catch food.”