Sigilyph (RCL 80)
Ability
Counterattack
If this Pokémon is your Active Pokémon and is damaged by an opponent's attack (even if this Pokémon is Knocked Out), put 3 damage counters on the Attacking Pokémon.
Psychic Assault
30+
This attack does 10 more damage for each damage counter on your opponent’s Active Pokémon.