It works like this. You can choose 6 out of Eevee and all its evolutions (Jolteon, Flareon, Vaporeon, Umbreon, Leafeon, Glaceon, Espeon). Then you try to beat a Pokemon games using those 6. Obviously you can't get Leafeon/Glaceon in a game that's not D/P/Pl. So don't pick those two if you're not...