I've actually been thinking about disallowing anyone with a "provisional rating" from being considered for playtest champion. The way ACRE works on PS! is very easily exploited insofar as making new alts with a good team and beating a few top players once or twice. You can theoretically make the top of the ladder after a mere three games on an alt, which is crazy. Removing accounts with provisional (and very volatile) ratings serves to remove these accounts from the running unless they play enough to get rid of their provisional rating and are thus consistently winning. This may be worth further investigation, and I will talk to the mods about it.
That said, Steels are everywhere thanks to them being Necturna's best responses. This of course results in Magnezone being the top response to a majority of them. Running Shed Shell is very helpful.