it makes a phione
You will need to place Ditto in the Daycare, and then with Manaphy to breed it.
mr backlots mansion on route 212. there is a book with its picture in it and that counts as seeing it.
The only way to get manaphy without Pokemon ranger is to get it from a Nintendo event.
go talk to sunflora she will tell you about the surrounded sea which has 20 floors at they end of it there is a manephy egg which hatces the next morning you wake up then you bring it to the guild and talk to chatot and then the freaking thing starts crying and have to find a freaking blue gummi they are so f***ing hard to find you have to go to craggy coast i had to search freaking 30 times until i found it then it looks for another one and then after that it gets sick and you have to go to miricle sea and get a phione dew.NOTE:you have to fight garydos and first part there is 16 floors then the second part which i think has 9 floors hope this helps;)