There would be no point to it. But since Pokemon Trainer isn't a totally un-needed character, I think it would be a neat idea. I think it would be cool to have alternate character models for Trainer, instead of just recolors. I'd like to be able to select between male Red, female Red, Blue, and maybe some Kanto gym leaders or various other trainers in the original games (and remakes).
Besides, it wouldn't be that much work. They would just need to make a few more character models, texture and UV them, then rig them. They could all use the same rig and animations, or at least slightly tweaked ones. I suspect that Trainer will only have a few animations, so they could easily tweak a few animations for each version. And since the character name is "Pokemon Trainer," there isn't anything odd about using characters other than Red (unlike with the Daisy costume being referred to as Peach, which isn't a big deal regardless).
