The Pokemon are Igglybuff, Jigglypuff and Wigglytuff. First you need a Pokemon who knows Surf then go Rustburo keep on going up til you're out of Rustburo and in Route 115. Go onto the beach and use surf keep on going up and miss the girl in orange keep on going until you reach a small beach go up through the trees and find some grass. Jigglypuff are quite common there so hope to find a girl one to breed and from the egg you'll get a Igglybuf. Evolve Jigglypuff with a moonstone to get Wigglytuff.
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
Omanyte is #138 in the national pokedex, and it is a Rock-Water type Pokemon.
Feebas
numbers 138 and 139 are Feebas and Milotic.
Carnivine is #455 in the national pokedex, and it is a Grass type Pokemon.
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
1 + 137 = 138
137+1
yes it is
136 is mandibuzz and 137 is heatmor
U Will Need Gameshark Codes To Complete The Pokedex In Pokemon Emerald.
It isn't in emerald and it doesn't exist.
138
Milotic
feebas
Beat Wallace/Steven
Omanyte is #138 in the national pokedex, and it is a Rock-Water type Pokemon.