I'm currently doing a Nuzlocke for Pokemon HeartGold and I'm currently at a move tutor. I want to teach my Togekiss Aura Sphere for both type coverage and because it's more of a special attacker than a physical one, but it's move set is really good, it's moves being Extrasensory, Fly, Flamethrower, and Sweet Kiss. I can't get rid of fly because it's the only Pokemon in my team that can use fly (I do have a Pidgeotto in my box, but I don't want to go through the trouble of leveling it up to match the rest of the team), and the other three moves are good for their power and the ability to confuse opponents in Sweet Kiss' case.

I'm leaning towards swapping out Sweet kiss, but tell me what you guys think I should do.

I'd say Sweet Kiss for now. If you change your mind, you can use a heart scale to get it back