Fifi leaves the nursery after 3 days and gains nothing. Ditto gains 600 experience and grows to level 35 with 350/3781 exp needed to level up. Victoria the Phanpy in March's PC enters the nursery to replace Fifi.
Both Ditto and Victoria leave the nursery. Ditto gains 3000 experience for staying 15 days and now has 3350/3781 exp needed to level up. Victoria gains 4 levels total for the 15 days she spent in the nursery and grows to level 16. She keeps her current moves.