Hmm, I solo leveled in the same cave in the World of Balance. I don't recall having to have a chaperone with her, or anyone. Gear setup and -ra spells was usually good enough. I might've summoned Espers here and there, but I can't recall if I did.
I should add that I leveled Celes with Str first, so the damage was mostly increased via level. I did start to duo level at some point, 1 str user and 1 magic user (I had a setup with more str-main users than you've had, but in retrospect most characters do benefit more from magic, as you say. ^.^)
Hmm, I solo leveled in the same cave in the World of Balance. I don't recall having to have a chaperone with her, or anyone. Gear setup and -ra spells was usually good enough. I might've summoned Espers here and there, but I can't recall if I did.
I should add that I leveled Celes with Str first, so the damage was mostly increased via level. I did start to duo level at some point, 1 str user and 1 magic user (I had a setup with more str-main users than you've had, but in retrospect most characters do benefit more from magic, as you say. ^.^)
Yeah I don't think anyone HAS to have a partner but it can really help some characters especially if you've leveled Gau.