While true, it's no different than Ash beating all the adult Gym leaders with new captures every series. Characters like Wulfric are like 50-60 years old and Ash beats him with his Kalos team that he owned for a few months
Man, wouldn't it be stupid if the pokemon with literally over a decade of experience lost to a pokemon that's less than a year old given its trainer was ten when he got it, ten when it evolved, and still ten when it battled in matches against the world's (current) strongest trainers