I am not into Battling as much as I am to writing all my pets into my General Story line. And my pets never leave me. However I do qualify as I don't part with any pet I adopt. Sorry to hear you are leaving.
I'm brand new to Subeta so maybe I wouldn't be the potential adopter you're looking for, but I really love cookie's name, look, and minion, and am also interested in getting into battling so I wanted to throw my hat into the ring. It looks like you've put a lot of effort into him, and I would try to continue that-- even if a bit clumsily at first. I do art too, and would have an amazing time drawing Cookie if given the chance to own him.
Whatever happens, hope everything goes well for you in the future!