>>56627519I mean there's even more.
Regigas also had to pull the continents in place, and watch as all his siblings were killed and turned into plates for Arceus to use.
When Regigas tried to remake his siblings he didn't have enough material (which is why they're so small and why Regidrago is just a head), but even THAT wasn't enough because humans sealed all the Regis away and stuck rubber rings on Regieleki's body to weaken it
So basically in revenge for the Giants attacking Arceus at the beginning of time, Arceus committed genocide, turned all the Giant's corpses into items powering itself up, enslaved the one survivor, cursed and weakened that survivor, and then imprisoned the survivor and all its offspring forever