>>34396645The theory is Alolan Grimer ate Zygarde cells and mutated into Guzzlord's. This explains his voracious appetite, relation to Zygarde, typing, and tendency to eat garbage over other foods. It also explains why it seems he is dying out in his own world, no more Grimer or cells left. They probably can't breed.
It's a VERY cool theory and I really like it, but I have my doubts.