Saw it by accident when running away from a Pokemon and ran out of time. Tried reloading my save, and even though it put me back into the hyperspace dimension, the Spoink was gone.

Outside Wild Zone 20. By the time I noticed it, it was already flying away, and I didn’t get to save in time.

Forgot to save before encountering. Did not check its moveset, and it used final gambit (I think, I added these notes months after the encounter)