More in depth...
Useless moves (literally won't do anything except waste time):
Camouflage (unless it becomes ghost type, it's not getting much from enviroment), Encore (Levi would start by slashing it, and could finish the same way), Present (Levi won't open a present thrown at him by an enemy...), Refresh (Levi doesn't abuse status effects or anything), Tickle (...), Body Slam (It's no harder to evade than titans)
Counterproductive moves:
Soak (Makes Levi resistant to it's only ranged attacks), Amnesia (Letting down your guard to become more resistent to magic is not helping), Belly Drum (It's not really AP that would be it's problem here, but losing half of it's HP certainly would be), Copycat (Asking to be dominated in skill)
Stuff that is usefull:
Aqua Jet (Not too difficult to sling around tough), Future Sight (Takes time to set in, but really hard to dodge), Perish Song (Possibly enforces an inconclusive, but it can just be killed before that), Supersonic (IIRC it's shown to work in a beam for whatever reason, but not sure) and it's ways of self healing.
Still, Levi would just keep stabbing it. Hell, teary eyes wouldn't weven work after being stabbed in the eyes, and I'm not sure the little thing would even have the psyche to actually keep fighting when deeply wounded in the way a blade twice your size would do (I'm not talking about "oh no he's gonna faint!", I do mean dismemberment).
So voting Levi.
