Pokémon ex rule: When your Pokémon ex is Knocked Out, your opponent takes 2 Prize cards.
Solidarity
If this Pokémon is in the Active Spot and is damaged by an attack from your opponent’s Pokémon (even if this Pokémon is Knocked Out), put 3 damage counters on the Attacking Pokémon for each of your Tandemaus, Maushold, and Maushold ex in play.