You'd be much better served by figuring out where your weak link was and fixing it than in trying to get multiple people to have the move.
Well, Liza and Fei-on both have DSC. My main weakness is that I was lacking in buff and healing spells and HP in general, partially because I never knew such things existed. All of the spells I should need are ones I can *buy* so it's mostly just getting the money for them and then wandering around in the Bio Lab till I get my JP up. Oh, and my equipment sucked because I forgot where the shops were.
I really don't mind grinding in SGF because you get better stats every battle more or less.
Partially I don't want to mess with the Mystics because, while Zozma and White Rose have potential, I really, really do not understand their growth system. Although it does give me something to mess with when i play as a different character (I thought there wasn't a lot of gameplay variety between characters in RS3 I guess?).
Anyway since Eusis mentioned OoT, that's a game I really liked, but the controls always felt... lacking to me. I think I got up to the fire temple, at which point I quit playing because I was having trouble doing parts of it because of the controls.