u need Pokemon ranger and in that u have 2 do a mission and put the egg in diomand
No, you can only get it by transferring the manaphy egg over to Pokemon Diamond or Pearl from Pokemon Ranger.
Behind Dialga when u beat him (only in Pokemon Dimand)
You can't.
Onux are rare ?
There is no Mewthree
sure can
yes
www.serebii.net
Pokemon dimand/pearl
sunnyshore city
25 dollars
started mine with chimchar