Damian Starter wrong on final battle

[Borja Llacer Sanz]

I chose Delta Charmander as my starter and I played through the story with him, battling with Damian and his Delta Squirtle/Wartortle/Blastoise all along. I just got the waterfall item, so i left Holon and went back to the Dream Realm, I've defeated Persephone and captured Darkrai, so the game sent me back to Erebus City, when Adam goes against Malde and I battled Damian, who had his regular team, but a Delta Charizard instead of a Delta Blastoise. (I'm assuming this is your final battle with him, not sure)