The Sinnoh Pokedex only has 151 Pokemon in it.
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There is no number 152 in the Sinnoh Pokedex however number 152 in the National Pokedex is Chikorita.
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.
Rotom is #152 in the Sinnoh Dex in Pokémon Platinum, you can find it by interacting with a TV in the Old Chateau in Eterna Forest during the in-game time of night which is between 8 PM and 4 AM.
National Dex: Igglybuff Sinnoh Dex: Togetic
In the sinnoh dex: porygon In the national dex: sunflora