In Pokemon Platinum Version, there are two Pokedex'es, the Sinnoh Dex, and the National Dex. In the Sinnoh Dex, the 151 Pokemon is Manaphy. In the National Dex, the 151 Pokemon is Mew.
Go to the first floor on iron island and it should be down the left stair case.
Pokemon #151 Mew. Pokemon #152 Chikorita.
Pokemon number 151 is Manaphy
151 is the Pokemon MEW
Manaphy is 151
151 manapy 152 rotom
manaphy you see it in the Pokemon manision.
The regional Pokédex for the Kanto region has 151 Pokémon.
manaphy
all original 151 Pokemon
Any of the first 151 pokemon.
its manaphy151 is mew