From Generation II onward, a Pokémon may even forget HM moves this way in Generation I, the player cannot deposit Pokémon that know HM moves in Pokémon Day Care. If a Pokémon reaches a level where it can learn a new move, it will always learn that move if the Pokémon already knows four moves, all of its moves will be shifted up one move slot, so that it forgets its earliest known move, and the newly learned move is placed last. As they level up in the Day Care, Pokémon will not undergo evolution. Pokèmon left in the daycare gain 1 experience point per step walked by the player. In Pokémon Black 2 and White 2, the Pokémon Day Care is not accessible until the player has entered the Hall of Fame, as Skyarrow Bridge is blocked until the player has completed the game. In Pokémon Black and White, the Pokémon Day Care will initially only raise one Pokémon at a time two Pokémon may be left after the player has received the Bicycle in Nimbasa City.
Any Pokémon left in the Day Care is completely healed.
Leaving a Pokémon at the Day Care is free, but withdrawing it will cost 100 plus an additional 100 for each level the Pokémon has gained while in Day Care. All Pokémon Day Care centers except those in Kanto and Orre can raise two Pokémon at once, facilitating Pokémon breeding. At Pokémon Day Care centers that can raise two Pokémon at once, if the player leaves a compatible pair of Pokémon, they will produce a Pokémon Egg in a process known as Pokémon breeding. The player can leave their Pokémon at Pokémon Day Care, where they gain experience over time.