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So, we finally get an answer to what they are. They're Arceus' discarded eggshell giants who decided to fight against him, lost, and got revived with his blood in them. They then build the other regis that scare the shit out of people and get sealed away.
That's why they're white, normal type, and have slow start. They're Arceus' eggshells that got BTFO before they got to fully start or were punished by Arceus to have a slow start so he can stamp them down before they try to rise up again so they pour some of Arceus' lifeblood into the golems to give them life so they can inevitably rise up.
They're the titan pokemon because they're like the titans of Greek mythology where they get beasted by the Gods before they escape confinement to fight the gods again.
The best part? In Greek mythology, Regigigas is Uranus.
He played us like a fiddle.