>>26705644It's not Ash that's the 'core' of the form, it's Greninja, Pikachu doesn't have the capability.
It's not the first Greninja to ever sync up, the one that Ash gets is related to it or something.
Greninja could have synced with someone else, his whole thing at the start of XY as a Froakie was trying to find a worthwhile trainer.
