Volteon
Back I guess??
FRLG tutor is risky since you can only teach it ONCE! ....(IIRC don't have the game =P)
(And you can't clone)
If you got the wrong Clefairy in the 3rd gen (i.e. if it evolves in DP and it doesn't have Magic Guard) you've lost your time.
In Emerald, you can clone the Clefairy and evolve in 4th gen. If it gets Magic Guard, teach Softboiled in 3rd gen and migrate. If it keeps Cute Charm breed another.
(And you can't clone)
If you got the wrong Clefairy in the 3rd gen (i.e. if it evolves in DP and it doesn't have Magic Guard) you've lost your time.
In Emerald, you can clone the Clefairy and evolve in 4th gen. If it gets Magic Guard, teach Softboiled in 3rd gen and migrate. If it keeps Cute Charm breed another.