You may have up to 4 Basic Pokémon cards in your deck with Unown in their names
Unown [C]
40 HP
Pokémon Power
[Chase]
As long as Unown [C] is your Active Pokémon, whenever your opponent's Active Pokémon tries to retreat, flip a coin. If heads, put 1 damage counter on that Pokémon. Apply Weakness and Resistance.