As long as a boss's health isn't NaN (though I'm not sure RPGM can handle that without throwing an error?) or above max damage calc and restoring health every turn, yeah, you can in theory cheese your way through any scripted fight. Modifying stats is fairly rudimentary stuff in RPGM, too.is it even possible lol?
If you mean "in the confines of the game itself" I'm a bit less sure about that one.