Quoted By:
Recently started something my friends and I are calling a "Babysitter Challenge", where each of my friends traded me an egg from one of their games into my new game of Y version, and I have to use only the 6 Pokémon they gave me for the whole game, unless I need an HM slave for something along the way or a specific Pokémon is forced onto my party for whatever reason. Once I finish the game and enter all six into the hall of fame, I'll trade them all back to their original owners.