After you thought you beat Resummoned Flareon, you see a blue vertical ray of light that stands out in the night sky. Flareon then appears with a new form, flying in the air

Flareon: At last... My true power has been unleashed. With this very power, your crystal stands little to no chance of survival, and I am confident in that. You will be nothing but ash, flying through the wind when I'm done with you.. And so, I'm not stalling longer.

Prepare to be eradicated from existence in the name of the SUN!