For the Sinnoh Pokedex: Rotom
For the National Pokedex: Chikorita
= 152
Number 152 is Rotom on platinum :)
There is no number 152 in the Sinnoh Pokedex however number 152 in the National Pokedex is Chikorita.
In the sinnoh pokedex rotom is number 152 but in the national pokedex rotom is number 479 and chickorita is number 152
rotom
rotom
Rotom
Rotom.
number 152 is rotom and you can catch him by going to the old cheatue
Rotom is the Sinnoh (platinum) region #152, obtainable in the Old Chateau at night (by interacting with the tv in one of the rooms)
Sinnoh Dex #152 -- Rotom National Dex #152 -- Chikorita
I don't know? Wait it's Rontom.