Nihilego [Reverse Holo] 106 / 214 Lost Thunder

Nightcap :

You can use this attack only if your opponent has exactly 2 Prize cards remaining. Choose 1 of your opponent's Pokémon's attacks and use it as this attack.

Void Tentacles :

Your opponent's Active Pokémon is now Confused and Poisoned.

One of the Ultra Beasts, it's unclear whether or not this Pokémon is sentient, but sometimes it can be observed behaving like a young girl.