https://www.youtube.com/watch?v=I-V_333EQqs Lockstin got early access to an early version of Pokemon Masters.
Battles are 3vs3. Total speed stat of your Pokemon influences how quickly you gain action bars to spend on Pokemon actions. Trainer actions don't consume these bars.
Notable stuff includes stuff like X Defense All, Pokemon not having Resistances, nor Immunities (Pikachu can harm Krookodile.), each Pokemon only having ONE Weakness (Like Salamence only being weak to Fairy.) & overworld movement is limited.
Hoopa appears in a humorous interaction with an NPC, & character stories are similar.
Previously non-speaking characters get entries about them, & sometimes dialogue. The player also has a trainer character for NPCs to interact with.
There's other details that might be considered spoilers.
There seem to be some evil people with masks. There is a Professor Bellis. She brings up your "Poryphone" having a "shiny, rainbow-coloured stone" embedded in it; It's a Sync Stone, which are quite rare. In fact, they can only be found "in the ocean here where Pasio was built". She primarily researches the interaction between Pokemon & Sync Stones, & says it's "quite brilliant". Sync Stones amplify the power that comes from a bond between a trainer & their Pokemon. She calls this "sync strength". Pryce: "It seems like you've been slacking off since we got to Pasio, Seel. If you'd been more focused during our last battle, winning would have been a breeze for us." (Pryce confident he could beat player character & their team?) Rosa: "Pokemon battles are a ton of fun, but sometimes it's nice to just slown down and take a stroll. Actually...that's totally a lie. The truth is, I'm always itching to battle! I just love Pokemon battling that much! If someone were to ask me what my favorite thing in the whole wide world is, I would absolutely say Pokemon battling!" (Interesting info about a player character character.) Flannery gives a "Training Machine" as thanks, saying she might forget she has it, & bring it into the hot springs, & then it'd be "no good to anybody". Description says it's used for learning moves & passive skills. Looks a bit like a Megaphone. Wikstrom: "Alas, the will to battle beats so strongly in Aegislash's heart, he can scarcely sit still! The brazen, bladed buffoon! Ha ha ha! I must apologizde if I have prattled on too long... 'Tis important to enjoy a good Pokemon battle now and again as well! Ha ha ha! Oh, my dear Aegislash! let us go now. We shall enjoy this merry festival of the PMI, with honor and grace!" (Wikstrom's Aegislash likes to battle, too? Also, festival of the PMI/PML?) Skyla, after a battle, says the player character & their Pokemon were "so earnest and straightforward". Also "It doesn't matter whether you win or lose! Being able to have friendly Pokemon battles is the best!" Erika says she couldn't agree with Skyla more. Rosa adds that while they're on that subject, they were actually hoping to could get a badge from you today, too. Karen notices a loose piece of thread hanging from the player character's clothes. Her Houndoom bows, raises its head, opens its mouth, & there's a white flash. Full scene not shown, but... did it BURN the thread off or something? I hope not. Hau (With his Raichu): "Huh? Are you not feeling up to this? Maybe our sync strength isn't as high as I thought. But we've surfed so much. Player: "Maybe you're forgetting something." OR "Maybe he's not comfortable with it." Evil team is Team Break. Bad guy is named Lear. Very conceited & considers himself notable on Pasio. Apparently, he created the artificial island of Pasio, which has no wild Pokemon, & founded the "Pokemon Masters League". Plans to be Champion. He Defeated Skyla, who, gladly gives badge when beaten, even thanking for the battle, also thinking she got a bit stronger, & praises her Swanna. He looks down on her for praising it after defeat, & considers Pokemon tools. With Lear are Sawyer & Rachel, who seem friendly with the PC, against Team Break. According to Sawyer, Lear made Pasio's volcanoes and glaciers look as realistic as possible, so trainers who come can battle in lots of different environments. Dialogue options with Lear after he gets angry at the PC for "interfering" again: "We can work together." OR "We wanted to help you." He rejects the former, Iris calls him out for being rude. Brycen-Man offers Rosa (calling her "Snivy-Girl") & her Snivy training. Blaine suggests PC battle Flannery. Dialogue between a male & a female swimmer reveals the male one has been getting interfered with every time he tries to catch a Pokemon. The female reminds him there are no wild Pokemon on Pasio. Lockstin got no ads during his month of Pokemon Masters. (But it wasn't released yet, so lol.) Currently, Monetization is gems; Buy with real money. Only known use so far is scouting more trainers to add to roster, via a "Sync Pair Scout". Quote Lockstin: "With the amount of story in the game, you get 18 trainers. Just for playing it." "Training"/Grinding earns gems. Lockstin says you earn "several", & finds it surprising for a premium currency. You also get 50 to 100 per week as log-in bonuses. Lockstin (Keep in mind, he's sponsored) mentions new trainers are being added "constantly". Lockstin says he was able to scout for more trainers about 16 times as of recording. 22 as of editing. Supposedly, he did about 40 days. Video shows 1 Sync Pair Scout costs 300 Gems, 10 bought at once cost 3,000, & there's a "Daily Discount" of 100. (Log-in bonus already used as payment?) 300 * 22 = 6,600. Meaning he earned 6,600 Gems from log-ins & "Training"/grinding over 30 to 40 days. Quote Lockstin: "If you buy your own gems, it'll only take 100 of them, each day." (As opposed to the price of Syncing once otherwise being 300 gems.) You can get the same trainer multiple times via Sync-ing. If this happens, the power of their Sync Attack levels up. Cheryl is a possible trainer. What looks like Blue seemingly appears with the evil team once. Also, in the same scene, a "Masked Man" in a group Pryce calls Thugs, asks "Wait a sec... Isn't that the Champion of the Unova region? Guess today's our lucky day! Come on, let's nab her Pokemon!" Pryce affirms they wanna steal Iris's Haxorus. Iris is apparently frightened by this revelation. Lockstin informs us, for 1 dollar, you get 1 Scouting. Crasher Wake says he "still isn't saying" Barry can be his apprentice, but Barry's certainly growintg & he'll keep an eye on him. Barry calls him master & is excited to have his skills acknowledged by his master. Wake tells him he's not his master, too soft, & Barry can still get stronger. Quote Lockstin: "As of now, no trainers are locked behind pay gems & you also can't buy level ups or enhancement items. Money just gives you more team customization options, earlier." Brock said he'd meet up with PC & Rosa at a place, but Rosa has a scene where she can't find him. Marley (who?) has an Arcanine & says "But there's so many things that I want to tell them. That's why I want to take as much time as I can to talk with Arcanine. Arcanine..." *Arcanine barks/roars*
Hopefully that's some nice info/not too spoilery. Also, Lockstin used Pokemon Masters music for his video, & in part (probably) due to sponsorship, is gonna do more Pokemon Masters videos.