You have to level up feebas with maximum beauty, which can be done by giving it poffins. It can evolve at any level as long as it has maximum beauty.
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Feebas will only evolve with high beauty.
the only way to evolve it is to have the feebas at a high BEAUTY status for Pokemon contests. and the best way to do this is to have a feebas with a MODEST nature.
Feebas does not evolve by level in Pokemon HeartGold. Feebas evolves when it levels up while it has a maximized beauty condition.
In Pokemon Black And White, Feebas will evolve into Milotic by happiness, and, as i recall, berries, this process is easier if it were 'Poke Transfered' from Platinum, Diamond, Pearl, Soul Silver or Heartgold, as you can feed a Feebas Poffins (Beaty) until it won't take anymore. Than you level it up once and it will evolve into Milotic.
max out it's beauty