...So, how about we forget what happened in Episode 14 and use this idea instead...
Anyway, if we ever face two gym leaders in one episode, it will probably be Hardy and Titania. Not together, but rather, we face one in Agate and the other in the mansion. I mean, no battle ever is two gym leaders vs one player. That would be interesting to see, but i don't know if Ame would use the 3-3 vs 6 or 12 vs 6 pokés rule. Since that's confusing, I don't think it will happen.
We might battle two gym leaders in one episode, but not at the same time. Just my thoughts on it.
Or, depending on what happens in the Waterfall thing, Titania might not let us fight Amaria until we defeat her. So yeah, maybe a vs Titania first then a vs Amaria in the same episode might work.