"Theory: Necrozmas involvement on the Alola Islands"

What if Necrozma is the origin of the Z-Crystals? Its been around for thousands of years and has a crystalline structure to it. I think it used to be an Ultra Beast but it just came a long time ago and lost the dimensional energy from it since its been asleep for so long. This would explain why they didnt have readings of it opening a wormhole and why the UB balls didnt work on it.The UB activity may have just awoken it cause it thought it could go home through the energy it sensed, but alas it was too late.Maybe the Z crystals are where its dimensional energy was stored. We see through Nihilego that some UBs can attach to other things.My theory is that the Z crystals were initially a part of Necrozma and through holding them, pokemon channel dimensional energy, increasing their power for a short time. Necrozma lost all its crystals and went dormant through energy loss. via /r/pokemon http://ift.tt/2r1vNpS