In emerald, Feebas can be ONLY found in Route 119. Remember this: Over the 400 water tiles that can be found on that route, only 6(SIX) of them have FEEBAS. So this is my suggestion: Bring a Pokemon that knows surf/ lots of repel/ super rod(because with this, you can only encounter CARVANHA and FEEBAS) and PATIENCE.
This is how it works: fish on every tile for 5-7 times(hard but hardwork pays big time!). Now, if you've seen a feebas, even if it is male/female, catch it so that the FEEBAS CATCH RATE on that TILE will increase from 25% to 75%. If you don't want the feebas that you caught, fish on that tile again.
Hints for a MILOTIC:
Your feebas should ONLY have the MODEST,MILD, RASH and QUIET natures because this natures is the only one who favors BLUE POKEBLOCK. Blue blocks raise a Pokemon's beauty which is the one that you need to evolve feebas. Maximize its beauty and when it is full, level up or give rare candy to your feebas so that it will become a MILOTIC.
Hints for Blue Pokeblock:
Use POMTRE Berry(can be found on the Berry Master House). The higher the level and the lower the feel, the best beauty you can get.
HOPE THAT HELPED!
how to evolve febas helped....but not how to find it.
the rarest Pokemon in Ruby Sapphire and Emerald is Feebas
Only in ruby, sapphire and emerald at route 119
if you mean which Pokemon is #138 in Pokemon Emerald it is Jiggleypuff in the Hoenn Pokedex or Omanyte if you have the National Pokedex
The Super Rod is the only Rod that you can use to encounter Feebas in Emerald.
you may only find feebas at one location and that's south of fortree use youtube to find the exact location.
trade
Throughout route 119.
the rarest Pokemon in Ruby Sapphire and Emerald is Feebas
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).
it is pretty rare, but keep on trying
You can't. You have to catch a Feebas & raise it into a Milotic.