I did it before I even started streaming, and I'll do it again. You can use a Rental Pass to get through the entire game even if you don't own any "real" Pokemon games. The postgame consists of much harder fights with much better Pokemon, but fortunately it's possible to take mons from the Gateway Colosseum!
Pokémon Battle Revolution Statistics For Mike the Entei
There are 1,513 views in 31 videos for Pokémon Battle Revolution. This game accounts for over 2 days of watchable video on his channel, roughly 5.25% of Pokémon Battle Revolution content that Mike the Entei has uploaded to YouTube.