Pokemon Platinum has two different Pokedexes: the Sinnoh dex and the National Pokedex. In the Sinnoh dex, #152 is Rotom. In the National Pokedex, it's Chikorita.
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There is no number 152 in the Sinnoh Pokedex however number 152 in the National Pokedex is Chikorita.
Number 152 is Rotom on platinum :)
Rotom
152: rotom (platinum pokedex) 152:chickorita (national pokedex) you can catch rotom when you examine the tv in old chateau between 8pm and 3:59am
= 152