As long as this Pokémon is in the Active Spot, your opponent can't have more than 3 Benched Pokémon. If they have 4 or more Benched Pokémon, they discard Benched Pokemon until they have 3 Pokemon on the Bench. If more than one effect changes the number of Benched Pokémon allowed, use the smaller number:
I ordered 3 tins, and they made sure to send 3 different designs, thanks! Sadly 1 tin did arrive with a dent in it. It also took almost a week to be shipped.