Is there a way to get manaphy?

Yes there is. At Nintendo events they will give you a password for Manaphy(nobody knows when) but to get Manaphy you need to have beat the game, have the Ranger Net, & in the ranger net you hold down at the same time : X,Y,L,R,A, & left on the directional pad to get the Enter Password mode. When you get the password (from a nintendo event) you will unlock a mission where Cameron finds the Manaphy egg in Summerland & gives it to Prof. Hastings to bring to his lab in Fall City but in the Lyra Forest the Go-Rock Squad steals the egg. When you complete the mission Prof. Hastings tells you the egg can only hatch in the Sinnoh region (the region Pokemon Diamond & Pearl takes place in). You can check on the egg in the Ranger Net as soon as you complete the mission & sometime in the Spring of 2007 (again, nobody knows Pokemon Diamond & Pearl's exact U.S. Release date) & transfer the egg. Each Pokemon ranger can get only one egg. When you transfer it to Diamond or Pearl you can hatch it into Manaphy. Breed Manaphy with a Ditto & you will get Manaphy's pre-evolved form, Fione. However, Fione cannot evolve into Manaphy(wierd) & Manaphy is the first legendary Pokemon that can breed. I know this is all true because I've seen a video of the Manaphy mission & the transfer of the egg on Wikipedia (not in English, however). Anyways, good luck.