get a ditto (go east from canalave city and use pokefinder) and then go to the solaceon town Pokemon daycare put a rotom and a ditto in there and wait a little while then go back and youll have a egg! :)
whats in the egg i don't know ]
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you can't breed shaymins because I have tried my way by having a ditto hold an item which helped me breed with Pokemon like Rotom, beldom and other genderless Pokemon. but no mater what i do i can't breed shaymin
Rotom is in the Amorphus egg group, so it can breed with any Pokemon in that egg group.
No trainer have Rotom in Pokemon Pearl, Diamond, or Platinum.
You cant
You can get rotom from Pokemon diamond, pearl & platinum, or if you have an action replay, pokesav it or wild modify it.