And yeah, Manaphy has its own special egg, and Phiones can't evolve into Manaphy. It'd be hated the moment it hatched.
I got a Manaphy egg!How nice...Wow! Perhap's it's Manaphy's child!?Little sisterAah! Manaphy!!Manaphyyy!!PhioneHey, onee-chan, give me Manaphy, I've aaallways wanted one!Is that right?It's better if I'm not born...