You must trade it while holding the Prism Scale
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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.
yes, you can find febas and milotic in white. i already have febas but i still don't have milotic, according to my pokedex, milotic location is on route 1
In generation 5 since there is no beauty stat for Pokemon you give the prism scale to feebass and trade it. It will evolve into milotic :D hope this helps
Tynamo will evolve into Elektrik will evolve into Elektross with a thunderstone in Pokemon White.
There are no poffins in Pokemon White. If you are wondering how to evolve a Feebas, you need to trade it with a Prism Scale, or take it for massages. These do increase its Beauty (in Black/White only) although this is never shown, and the values are not used for anything else in GenV.