Milotic
After you catch a Feebas, be sure it's personality are one of the follows
Calm(+ Special Def, - Attk)
Gentle( + Special Def, - Def)
Modest( + Special Attk, - Attk)
Do 8 pokeblocks 7 out of Kelpsy, and one out of Corn Berry.
Raise level and there you go.
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