Aaaah, I thought that place only got that feature after it switched over to 4, though I'm very likely remembering wrong, I don't use Bulbagarden much.There is a way for users to change their own username on VB3, if that's what you're referring to. Bulbagarden had it, and made it set to 90 days.
I mean, if PC could do that and switch up the rules a bit to suit it, it would take some workload off the admins.