According to the serebii's eventdex, Manaphy should be tradable via gts and wondertrade. If it's caught in pokeball and the meet location is Sinnoh or Johto there are several chances that yours should be legal, or at least legit.
If you want, you can check it by yourself:
http://www.serebii.net/events/dex/490.shtml
If you want, you can check it by yourself:
http://www.serebii.net/events/dex/490.shtml
" Sometimes you must HURT in order to KNOW, FALL in order to GROW, LOSE in order to GAIN because life's greatest lessons are learned through PAIN."
-Pain
