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I read about how'd in the beginning of the setting, humans and pokemon are the same. So in this headcanon of a game, just make them the same.
Set in an antediluvian, lost history period, you're some proto man who had to fulfil some prophecy that unbeknown to you will set the distinction between human and pokemon forever.
You recruit pokemons into your team by fighting and then negotiate with them. You learn new moves by talking to mon and have them teach you. You can change your typing by mastering a skill, like cooking, farming, critical thinking, etc. All of those skills eventually contributes to the prophecy that separates human and mons, for humans now had the ability to change their world.
Basically like a pseudo SMT set in pokemon world.