take it to a Pokemon daycare after you beat bugsy and learn the move cut or get alot of rare candies or battle tons of trainers
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Feebas does not evolve by level in Pokemon HeartGold. Feebas evolves when it levels up while it has a maximized beauty condition.
Teach it Ancientpower, then level it up.
Some Pokemon learn ancient power as they level up.
you need to get its friendship up and level it up
I think you have to level it up to Level: 34 hope this helps