The video is just the old Keyboard Cat video but with Pokémon.
The joke is winter_frost and I had a joke argument about turning me into a meowstic after I commented on someone’s fan art of meow stick she posted. I took the joke a step further and allowed them to make my username because I lost. When I told her I’m changing my username, we had another argument about whether or not I was now a Zeraora. If you can tell by my username, I think you know the outcome.
When I told her I was changing my name again, she responded with Luxray as the next pick, hence, my current tagline.
This is all just a long running joke between us.