In Generation I and Pokémon FireRed and LeafGreen, only one Pokémon can be dropped off at the Day Care. After obtaining the National Pokédex and defeating the Champion Blue, the player can access the Sevii Islands and at Four Island there is a facility in which he/she can store their Pokémon. If both are different genders and are in the same Egg Group, they will most likely breed a new Pokémon. In Generation II, onwards, two Pokémon can be dropped off at the day care.