Jeez your team is all over the place. The Elite 4/Champion scale based on level of your highest level pokemon, which leaves you totally screwed since you have a lvl 100 and multiple lvl 60’s. Also, why have giratina and d. charizard when they’re the exact same typing?
I beat all elite 4 but cant beat champion
no one can help you if we dont know the remaining mons of champ and your movesets
the champ’s (not gonna spoil) team for all difficulty is on the insurgence wiki
i used champ to not spoil too