You can find Feebas along route 119 in Pokemon Emerald. Feebas is often over looked similar to Magikarp due to its dull wit and unattractive appearance.
use a good rod for a febass. and they are mostly in sapphire
route 118
you cant.
mt coronet trust me
in route 119
You cannot get feebas in-game, it has to be traded from either ruby, sapphire or emerald. You can get feebas in R\S\E in route 119 and just like D\P\Pt there are only 6 fishing spots.
quiet cave on pokewalker
You can't catch Milotic. Instead you have to catch a Febass and max out it's beauty and level it up. Febass can be caught either at the Quiet Cave Pokewalker route or in a lake somewhere but I forget.
its called febass and yes
It is in a certain body of water in Mt. Coronet. (Need Super Rod)
You can catch him on Mt. Coronet (upper) B1F with the old rod.
Just like the regular ones - in the Febass spot you just have to get lucky.