You can't find it in Pokemon pearl.
The only way to get it is to transfer manaphy from Pokemon ranger to Pokemon pearl on mystery gift.
Sorry, but your wrong. My cousin traded me manaphy off of Pokemon diamond. i have Pokemon pearl. My cousin does NOT have Pokemon ranger or that mystery gift thing that you are talking about. Anyways, i watched him catch it. So you are incorrect. You tell me otherwise, but ill need proof. When i see things with my own eyes that's when i believe them.
I think your cousin hacked or something because when i got manaphy my brother's friend used action replay on it to trade me.
Excuse me person who wrote the second answer, I DO have proof that Manaphy is only obtained by transferring it from Pokemon Ranger, unless you hack. Here are links to prove that what I put is the right answer.
Links: Scroll down until you can find where to acquire Manaphy
http://bulbapedia.bulbagarden.net/wiki/Manaphy_(Pok%C3%A9mon)
http://answers.Yahoo.com/question/index?qid=20070417180942AAI1AY5
http://www.ehow.com/how_2315446_get-manaphy-egg-Pokemon-ranger.HTML
My brother confirmed this because he has an Action Replay and he got Manaphy in his Diamond version by hacking, therefore no offense to you, but you are wrong.
You can't catch manaphy in Pokemon pearl, diamond, or platinum. You must transfer them from Pokemon ranger: shadows of alma.
Beat Pokemon Ranger, you'll get a Manaphy egg that can be moved to Diamond, Pearl, or Platinum.
Once you have traded the manphy egg to Diamond or Pearl, restart the game and go to any pokemart. There you receive your manphy egg.
No. you must beat the game before you can try the Manaphy mission.
You get Manphy by completing Pokemon Ranger 1 or 2 and doing the special Manphy mission. You can also see Manphy by, after beating the elite four, going to Mr Backlot's Mansion and going into the room where he is and looking the book behind him.NoteIf you want Phione the breed Manphy with a Ditto
You have to transfer it from Ranger.
you have to trade it from Pokemon ranger
buy a pokedex.
you do not find dialga in Pokemon pearl
thats what i wnt to know rotom and manphy can when you breed manphy a phione haches
Trade with Pokemon Pearl or Pokemon Platinum
There was an event for manaphy egg.