Manaphy
You cannot see manaphy but in the trophy gardens you will find a fancy notebook read it and you will have manaphy in your pokedex.
The Sinnoh Pokedex only has 151 Pokemon in it.
Manaphy
151
Number 151 is manaphy
151 sinnoh pokedex 493 national pokedex
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.
150 hope i helped :) Actually there are 151 pokemon in the Sinnoh Pokedex but you only have to see 150 to get the National Pokedex.
sinnoh pokedex: manaphy, rotom national pokedex: don't have it yet
In the Sinnoh Pokedex, Pokemon #151 is Manaphy, but in the National Pokedex it is Mew.
The 151 first Pokemon is Manaphy if u have Pokemon Ranger you have to finish the game to get Manaphy and that is the only way to get it.
#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...
Manaphy...go to the Pokemon mansion and look for a book on a table. Talk to it and it will add manphy to your pokedex