>>34333800The game doesn't call it a real gym, but rather a "gym stimulator" who want "the Kanto experience".
And keep in mind that in the series Gyms are known to be officially built and run by the Pokemon League. You collect badges so that you're qualified to battle the E4. The Pokemon League in USM didnt get built until the end of the game and it didn't require any badges since the League was still new and needed time to do things like build Gyms