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To finish the sinnoh dex (Pokemon platinum's,diamond, and pearl dex) you just need to see every Pokemon not catch every Pokemon.
You have see to many different pokemons. Then you will fill it (you have to every Pokemon to get national pokedex).
on platinum, you see Manaphy in Mr.backlots Pokemon mansion
Route 225 is not a route that can be found in Pokemon Firered, route 225 is in Pokemon Diamond, Pearl, and Platinum. To get there is Diamond Pearl and Platinum, you have to see every Pokemon in Sinnoh, then talk to Prof. Rowan and get the national dex.
in an egg