Everyone put guesses down below, and after a bit I'll tell everyone the winner!

Neither, they'll draw?

Valiku has a lot more skill and experiance with then lightstar.
Lightstar could have theoretically used Evengalion and ended the fight, but Valiku can output/survive output of the attack, as well as anything else Lightstar can throw at her.

So...Eventually they'd draw?

Valiku'd win.

Close enough, ey? Just like this.

Lightstar

Zacian and arceus have the same stats tho...but i’ll say this because it’s fused with an eeveelution, not eevee.

Your right, but not cause valiku's fused with an eeveelution.
Valiku has a lot more skill and experiance with then lightstar.
Lightstar could have theoretically used Evengalion and ended the fight, but Valiku can output/survive output of the attack, as well as anything else Lightstar can throw at her.