[W] Prehistoric Water
Flip a coin. If heads, and if your opponent has any Evolved Pokemon, choose 1 of them and shuffle the top Evolution card attached to that Pokemon into your opponent's deck.

[1W] Dark Tentacle (30)
During your opponent's next turn, your opponent cannot evolve the Defending Pokemon. (The Defending Pokemon can be evolved through attacks or Pokemon Powers.) (Benching this Pokemon ends this effect.)