Hey guys, I have a question for my nuzlocke.

See, I caught a Dewgong, and I was training it in the wild. He got low on health so I went to use a potion; but i was using the speed-up and accidently used a Pokeball- and caught the wild dewgong.

I know I can't keep it, but if I didn't catch it, my dewgong probably would have died. (She had 4 HP left)

What should I do?