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Unless I am misunderstanding the issue(I assume this is the player sprite becoming corrupted), you simply need to lose any battle and the sprite will return back to normal. You can deposit your party using the PC in your cabin to make it easier.
If you've already saved while stuck, then I'm...
The dev branch contains the most current versions. Cubone gets it as a level 1 move, as it normally learns it via TM in official games. It's not so much as a bug as it is an oversight, if I increase the level of wild Cubone in that area to 11, they won't know Aerial Ace(you can use the Move...