mehmeh1
Not thinking twice!
I know this is a DBZ reference, but...."Burst Warriors"....lemme guess, ReBurst?Tournament gets interrupted in the finals by Giovanni making a surprise attack on the stadium.
Suddenly, a young adult appears out of a wormhole, riding on a weird purple yellow motorcycle dragon thing, and uses a Kartana to slice up Giovanni's and Team Rocket's current machine or mecha and forces them to flee.
Young man cordons Ash away from the others and warns of two super powerful Burst Warriors that ravage the future, and he's the only one left of Ash's group of friends in that future that's left to fight.
It's Lei. Cue next series.