Muk

Muk is card 89 in the 151 set (2023), a uncommon Pokémon card with the Darkness type, so it has a black card frame. In Tall Grass Club you'll find it about 1 in 16 packs when you open free 151 packs.

Uncommons appear three to a pack, so keep opening and it will turn up.

Want to know more about the Pokémon? See Muk in the Pokédex.