there are 6 tiles where feebas can be caught its super rare so it will take a long time.be patient, you will find it i have a milotic in lv100.its all worth it. but you need a super rod so good luck.
trade
the rarest Pokemon in Ruby Sapphire and Emerald is Feebas
Throughout route 119.
in rout 114. with fishing.
you have to max out feebas happines and then level it up one level :DDD
Actually, it's impossible to catch Milotic in any Pokemon Game. But, it's possible to catch its pre-evolution, Feebas. To catch Feebas in Pokemon Emerald, there is a complicated way. But, I know that you can catch Feebas in Route 119. Hope I helped :)
supe rod
you want catch it with the rod in rout 119.
no
Feebas appears when fishing with an old rod in route 119 (extreme rare to the max but I got him in pearl).
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.
it is pretty rare, but keep on trying