Its a shame that so few iconic trainers actually visit the Battle tree, because I honestly think it could have been solid with around 11 more. Heres a list of the characters I think should have made it:

Silver
Eusine
Lance
Alder
Hugh
N
Barry
One of the stat trainers
AZ
Zinnia (Hate the bitch too, but nice theme, and her Team is okay-ish)
Steven

Do you think the Battle Tree would be okay with this expanded roster? A few of those characters already have models too.