look on http://www.serebii.net/pokedex-dp/001.shtml
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sinnoh pokedex: manaphy, rotom national pokedex: don't have it yet
#151 in the sinnoh pokedex is rotom. you can find him at the old chateau at night in a TV. #152 in the sinnoh pokedex is manaphy. manaphy cannot be obtained directly in platinum, if I'm not mistaken. you'll need to play Pokemon ranger. #151 and 152 in the NATIONAL pokedex however, is mew and chikorita...
There is no number 152 in the Sinnoh Pokedex however number 152 in the National Pokedex is Chikorita.
The Sinnoh Pokedex only has 151 Pokemon in it.
Rotom