Typically, there are two people who run the Day Care Centre: one who lets the player deposit and withdraw their Pokémon, and one who gives the player any Pokémon eggs that appear there. There can only be a maximum of 2 Pokémon in the Day Care at any one time. Any Pokémon in the Day Care will gain 1 Exp point for each step the player takes. If a deposited Pokémon levels up and would learn a new move, but it already knows 4 moves, then the first known move is forgotten, the rest bumped up, and the new move learned. Any move can be forgotten because of this, including HM moves.