#151 of the Sinnoh 'dex is Manaphy, you can see it in the Pokémon Mansion, reading the book.
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Number 151 is manaphy
The Sinnoh Pokedex only has 151 Pokemon in it.
151
There is only 151 (including Giratina) Pokemon in the Sinnoh Pokedex, therefore there isn't a 193rd Pokemon in the Sinnoh Pokedex as it does not exist.
151 is Manaphy and can be found by looking at the book in Mr. Backlot's room in the Pokemon mansion on route 212.