Almighty Zard
He has returned.
Revenge in the sense that he never beat Alain. You don’t have to lose unfairly to someone in order to have a revenge match. You just have to lose, period.
the problem is, to the people who want this revenge it's not just about beating ash beating alain, but rather Greninja has to do it by beating his Mega Charizard X, otherwise it wouldn't count to them.