After the part with Heather, you have to go down to that Yureyu Power Plant and meet a meteor there, and I think it should be someone who is capable and trusted, so Lin sends Solaris to trade the ring for their hostage aya. And since you don´t wanna give him that ring, you get a rematch against him, cuz you are around level 75, so is his garchomp. And you´re going to PWN THAT MOFO AND AVENGE KIKI!
Just kidding. I don´t think this will happen in Episode 14, you probably go down to Yureyu again, but maybe very late in the game, or maybe not at all. Might be after saving Titania and Amaria.
The one who appears there might be some Admin, maybe Taka or ZEL. Or they send down Aster.
But the location makes me curious: If something happens, will Shade intervene? I mean it´s right in front of his gym.
He might be watching and help you if something bad happens during the exchange, because he seems to be a good guy. That might be the reason why Charlotte even chose that location. Imagine Shade appearing out of nowhere (like he apparently can), taking Aya away from the guy and trolling Team Meteor hardcore because then they no longer have a method of pressuring you to hand over the ring.
Blake. Well, if that guy is going to appear, so might Cal. Maybe you´re going to help him take down Blake, or Cal will fight Blake all by himself? Unlikely though. I think Blake is a very strong trainer and IF Cal appears, he´d have to team up with the player to fight him 12vs6 (Two teams against that one strong team) Or maybe Cal might not appear in this episode at all. Apparently Heather doesn´t like Blake that much, judging from the Episode 14 Teaser, and she commands her Salamence to attack. I guess the player is there, so what might happen is that Blake survives this, gets out his ice-pokemon and you have to fight him somehow. Either that or her Dragon-Flying-Type gets instantly pwnd by an ice-beam AND then Cal shows up. I really think he will somehow make an appearance.
Some people think that we´ll fight Ciel on Ametrine Peak, but I don´t think so. I think we´ll face her in the same arena as samson, because that field seems to be for both her and samson. Double damage for acrobatics, dragon-dance amplified, sing hits 100%. That´s some advantage a flying-trainer could use well, especially with an altaria that has sing and dragon dance. But maybe I´m wrong (probably).