For those who might be interested, here're some translations or explanations of things that were said during the episode:
-Serena says she just needs one more Princess Key for Master Class (Eureka finds it "incredibly pretty"), and that she'll rely on Eevee next time. Satoshi says he can't slack when she's getting ahead. Citron reiterates Tierno mentioning its a Psychic Gym (which Citron said, actually >_<), but Satoshi says he'll handle whatever comes his way.
-Malva's broadcast discusses how Prof. Sycamore's examination will have big implications for Mega Evolution, etc. Also awesome foreshadowing for Act IV is awesome.
-Team Rocket's main concern at the beginning was how they'd be able to lift the sundial due to its massive size. Kojiro also hilariously spoofs Prof. Oak to showcase what he'd be like as an expert (since Sycamore is already one).
-The girl who attacked Satoshi and co. (Carrie), as well as the other person who arrived along with Gojika (Cheryl) are Gojika's higher-level students. They were assisting in teaching the other people at the beginning how to "connect their hearts to their Pokemon" by "being the stars themselves". (Likely a reference to the notion of Astrology allowing people to predict the future.)
-Gojika's vision at the start (during which she says, "I can see...the light!") is said to have implications for all of Kalos, as well as particular significance to Hyakokku City. She points out Satoshi and co. (with Satoshi being pictured) as being involved, and cites Prof. Sycamore as being the "path" to the events which transpire. Carrie jumps the gun and attacks Prof. Sycamore, followed by Satoshi to try and defend "all of Kalos". (When she sees Satoshi after he arrives to help Sycamore, she realizes the vision was definitely true and hastens are attack).
-Gojika chastises Carrie for her hasty actions and apologizes on her behalf, and Cheryl encourages her to apologize as well.
-Sycamore: "You're Gojika-san...right?" Gojika: "Indeed." Gojika speaks with a very dignified air. She also refers to herself as "waga" and "wara" to that end. Also refers to Satoshi's Gekogashira as, "sona ta no Gekogashira."
-Just as their speaking, Gojika gets a vision of Gekogashira's evolution (and a glowing red light around its head. We all know what this is alluding to, but this is still incredibly exciting. WHY DID THEY HAVE TO SPOIL IT WITH THAT HYPE POSTER?) ("What is it? What did you see, Gojika-sama? -Your future." .@Gekogashira.) She says they'll discuss the rest at the Gym (that starry area from the start).
-At the Gym, Eureka asks if she should ask Gojika who to keep for Citron. Probably a bad idea...
-Cheryl explains how Gojika can also predict disaster, and Sycamore inquires about whether she knew about the Hoenn Disaster. She predicted that too.
-Satoshi: "A Gym Leader that can see the future, huh?"
-Gojika says Satoshi's Pokemon is "different from other Pokemon." Says that in order to understand its future, they must first see its past.
-Satoshi asks if Sycamore knew the whole story of Keromatsu's birth, but he was unaware since it was outside his observations.
-Most of the Keromatsu were carefree and jovial. Keromatsu instinctively preferred training, so they ostracized him due to his unusual tendencies. So he grew distant from his fellow Pokemon.
-When he met his trainers, their notions of strength and its pursuit were incompatible with his. Their feelings were insufficient.
-15:52 Just wanted to say this OST is amazing.
-It's revealed that ultimately Keromatsu was looking for something even more important than strength: "love". Then the vision shows when he met Satoshi.
-Satoshi says he also wants to strive to be stronger, and says he and Gekogashira will strive for it together through the League and becoming a Pokemon Master.
-Sycamore asks about Gekogashira's future. She says it will achieve "another power", and Satoshi asks if she's talking about Gekkouga. She says that's there of course, but that its future is one beyond that future, and that both Satoshi and Gekougashira will achieve it. Sycamore asks if she's talking about Mega Evolution, and Satoshi gets excited. Sycamore dials things back a bit, though, saying that at this point even he doesn't know if Gekkouga can Mega Evolve. Satoshi immediately challenges her to a battle. She agrees and asks for his name.
(This is curious... would they openly question whether Gekkouga can Mega Evolve in the anime, specifically Satoshi's, and then introduce a different form change that's anime-exclusive? If it were anime-exclusive, it's likely Gekkouga could still get a Mega Evolution in the games. This may suggest there's no Mega Evolution in-game though, since Game Freak is really specific about not allowing the anime to spoil unannounced plans or characters, which could have otherwise pushed the writers to avoid talking about Ash-Gekkouga relative to Mega Evolution at all.)
-When Gojika sees that the sundial is in danger, she has the male Meowstic use Helping Hand, and has the female project a Future Sight. Citron explains Future Sight upon Serena's inquiry. Future Sight's mechanism in the anime is totally revamped (and awesome). A timer starts, and when time runs out, the attack will strike its target without fail (evidently regardless of location as well). Since Gojika can see the future, she can technically direct the Future Sight to the location of her visions. It's a move that effectively cannot be stopped, because it guarantees a certain future.
(The integration of Gojika's psychic abilities and character with her battle style is awesome. Ironically the Gym Leader with the least development in-game is getting some of the best in the anime. Good on the writers for using her character as such an effective plot device, and setting her up as the very personification of unstoppable limits on the future that Satoshi must overcome.)
-Satoshi asks if the attack on TR is Future Sight, Citron confirms that it's the same move Gojika set up beforehand. (She didn't even move!)
-Sycamore says Gojika's abilities to see the future are formidable, and Citron concurs that if one already knows the future, nothing can be done about it. Serena, in awe, asks, "Satoshi will have to fight this person?"
Overall, I'm incredibly pleased with this episode. Also deciding NOT to watch the preview so I can thoroughly enjoy next week's the potential evolution it may entail (whether it happens or not, I haven't seen it. My expectations aren't specific enough to be "betrayed". Haven't been hyped for a Gym Battle like this all season.)
