Battle Tree roster is so shit, Johto doesnt even have any represantation and outside of Kanto and Sinnoh other regions contestants feel so random

They should've done a challenge for the strongest trainers in each region rather than random strong trainers from each region

Red and Blue from Kanto
Lance as champion and Silver as recommended by Lance
Wallace and Steven from Hoenn
Cynthia as champion and Barry as recommended by Cynthia
Alder and Iris from Unova
Diantha as champion and Korrina as the Mega Evolution successor

This would've been a lot more exciting roster