It's Milotic
In the Sinnoh Pokedex it is Feebas and Milotic, however, in the National Pokedex it is Omanyte and Omastar.
That depends. In the Sinnoh Pokedex, #139 is Milotic. In the National Pokedex, #139 is Omastar.
If you have the sinnoh pokedex, number 139 is milotic(milotic evolves from feebas). If you have the national pokedex, number 139 is omastar(omastar evolves from omanyte).
Omastar in the National Dex
Elekid is number 197 in the Sinnoh Pokédex, and number 139 in the National Pokédex.
147 is Mesprit and is found in the cave in the middle of Lake Verity after you complete the Spear Pillar.
139: Milotic, MUST evolve a feebas by maxing beauty condition
Milotic
In Pokemon diamond number 139 is Milotic.
you catch a finneon and then make it evolve, or you could just catch a lumineon (the Pokemon finneon evolves 2 and number 135)
numbers 138 and 139 are Feebas and Milotic.
It's the water type, Milotic.