most of the final bosses aren't weak, but almost every one try's to max up before fighting the final boss. it's easy that way, but if you are on the regular levels it's pretty hard i think.

and they always come in a pair cuz it's harder to beat them then, when you have defeated one, your not fully healed so it's easyier for the second boss to kill you. but if your maxed up, its a piece o' cake !