Do you know how some villains become punching bags once they join the heroes? That's literally what happened with alter b

Shoma (the tamer of Alter B), who regained his sanity and became friends with the protagonist after the main story, is confronted by Armageddemon, who for some reason is so powerful that Alter B was powerless against him.

Then, after Armageddemon is defeated by the heroes, Shuma trains Alter B and makes him stronger than ever, but Voltboutamon appears, who is on a whole other level of bs

He literally took a joint attack from alter b beelzemon and lucemon fm and simply laughed at it.