Feebas is #349 in the national pokedex, and it is a Water type Pokemon.
In the Sinnoh Pokedex it is Feebas and Milotic, however, in the National Pokedex it is Omanyte and 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).
feebas
Feebas
In the National Pokedex Muchlax is number 446.446
Growlithe is number 58 on the national pokedex.
Gyarados is #130 in the National Pokedex.
In the sinnoh pokedex (the first one) its feebas, you find it only in the part of mt. coronet between celestic town and eterna city. In the national pokedex its omanyte wich you get by reviving the helix fossil wich you find underground.
Croconaw is number 159 in the National Pokedex.
Eevee's number in the national Pokedex is #133. If you don't know what the Pokemon's number is then go to pokemondb.net/pokedex/national It is a great site to find Pokemon's number!!
Sceptile is number 3 in the Hoenn Pokedex and number 254 in the National Pokedex.
Shaymin is number 492 in the National Pokedex.