Be fair I wanted too be cheeky, and not suggest the typical 'healer' mons.
Combat Note:
I did play through the last three characters. And I can confirm Only Rata, Really suffers at the start if on Medium, or Hard... Maybe Arbok as a close second. So yeah, the rat, and the snake (maybe) need a lil boost stat wise.
Completely on the side, Lopunny is a bit unhinged with the turns she can give herself, jeeeez...