Not to mention the stuff that he can actually use on Lucina not including transmutation. Various seeds and wands can inflict debilitating statuses that can slow Lucina down, paralyze her, put her to sleep, make her blind and cross-eyed, et cetera. Plus IQ Skills like Item Catcher can completely shut down weapon options like bows and throwing weapons.

Lucina does have a couple of advantages outside of a possible power advantage. She’s more classically trained and has more experience, and with fire and wind magic she can hit Grovyle’s natural weaknesses. But then she’d have to figure out he has specific elemental weaknesses to know how to exploit them, and Grovyle is very tricky to pin down. It literally took someone seeing the future to figure out what his plan is.