Just to let you know, that Feebas is confusing to catch. Anyway, here is the answer. Around route 119, theres is over 100 square tiles of water. Feebas appears in only 6 tiles of water. Feebas stays in those tiles of water until you change the "Trendy Phrase" in Dewford Town. When you change the phrase, the tile locations will be switched to other tile locations. It doesn't matter what phrase you say. If one person says the same as another and finds a feebas, in the other game, theres a big chance that the other person won't find it in the same location.
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you have to max out feebas happines and then level it up one level :DDD
it is pretty rare, but keep on trying
u can find feebas in 6 various places on route 119 near fortree city.
on rount 119 note use super rod
You need to evolve a feebas to get a milotic to do that you must maximize feebas's beauty stat by feeding it blue pokeblock made from a ganlon berry to get that berry you need to trade it from Pokemon colosseum or Pokemon xd gale of darkness.