>>34539301They did that in the first smash with the Pokemon trainer.
Multiple problems, including a steady decline in each Pokemon's base power from switch in, the hidden "types" of other characters being disproportionately heavy on Fire, which made Charizard's and Bulbasaur's attacks *resisted*, and the almost non-existent "grass" and "water" types, plus the neutral "electric" types made 2/3rds of the tamer's build *suck* at any given moment.