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You cannot find Manaphy anywhere within Pokémon Platinum in order for you to catch it but if you're looking for its data in order to add it to your Sinnoh Dex as being "seen" then there's a book in the Pokémon Mansion that is near Hearthome City that will add Manaphy to your Sinnoh Dex for you so that it counts as being "seen" towards your Sinnoh Dex "seen" completion.
What else can I help you with?
How can you catch manphany?
You transfer the egg from Pokemon Ranger.
How do you cacht manphany on pearl?
you need Pokemon ranger to get manaphy
Where do you find all of the Pokemon in Pokemon Platinum?
buy the Pokemon platinum book
Where do you find the 151st Pokemon in Pokemon Platinum?
The 151st Pokemon is Mew and is unobtainable in Pokemon Platinum.
Where can you find a Torchic egg in Pokemon Platinum?
no you can't find a torchic egg in Pokemon platinum
How do you get spirtomb in Pokemon Platinum?
try your best to find spirtomb in Pokemon platinum
Where can you find route 233 in Pokemon Platinum?
There is not a route 233 on Pokemon platinum.
How do you catch Zekrom in Pokemon Platinum?
You cannot find zekrom in pokemon platinum
What are all the Pokemon in Pokemon Platinum and were can you find them?
you find them in the cave
Where can you find a barmy in Pokemon Platinum?
there is no such Pokemon
Where you can find a elikid in Pokemon Platinum?
breed an electabuzz if you want an elekid in Pokemon platinum
Where can you find Manaphy in Pokemon Platinum after I finish the sinnioh Pokemon?
You can't "find" him. You have to trade the egg from Pokemon ranger over to platinum, where you can hatch it.
