To get the National Dex and be able to catch Giratina (along with other events) you only need 150 Pokemon. All of these Pokemon can be seen from battling other trainers, you don't need to own any and evolve them yourself because other people have them.
Use the related link. When you open the page, scroll down slightly and you can see all the Pokemon along with their Sprite, number and type. Manaphy is at the very bottom who you don't need.
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151 in Pearl and diamond, but 210 in Platinum.
there isn't one the highest is #151 manaphy This statement is true for pearl and diamond but in Pokemon platinum the Pokemon with an Id of 192 is Porygon
Manaphy is 151
151 manapy 152 rotom
In Pokemon platinum, the number 151 is Manaphy. You see him by going to the one mansion with the trophy Pokemon garden in it. In the room with the owner, you will see a book. Read the book to get him in your pokedex. Otherwise, you will need to have a Pokemon ranger event to get Manaphy.