The Thunderbolt TM isn't available in chapter 3.
Chapter 4 is still very early in development, and a trailer won't be coming until it's very close to release.
I have no idea when chapter 4 will be ready, my current estimate is 8-12 months, given how busy I'm expecting to get soon.
I do have plans for a v0.3.3 patch which will add a lot of replayability and a bonus sidequest before chapter 4, hopefully that'll be ready within only a month or two.
In the meantime, there is still a good bit of post-gym 6 content available, including a handful of dive spots, Hallio's Crown, the battle facility in Mirable City, and a lot of optional dialogue you can get by going back to old gym leaders. You can also try joining our Discord to discuss how everything fits together with the other members there. There's been some good discussion already, and it's always good to see new takes.
You can try playing it through JoiPlay on Android. There are a few issues you might run into, but if you're having trouble with it, our Discord's got a Joiplay Support channel with some users that have gotten the game running.
Level it up while holding Prism Scale.
All evolutions that are usually "trade with item" are instead "level with item" in this game. A few other of the more obscure evolution methods were also changed, which are recorded on this spreadsheet.
1) Yes, the Dragon Cheer TM to evolve into Hydrapple is available immediately after gym 5.
2) That's a bug where you can get locked out of the item, I only noticed it a few days ago. It's just a Super Repel, so you're not missing out on anything important, but it is something I'll be addressing in the next patch.
Maybe. There is an NPC ingame who trades you a foreign Ditto for Masuda Method, so that hunting method is possible.
Shiny Charm is technically in the game, but requires 213 Pokemon in the dex (the max at this point in the game), including stuff like Hydeigon. Part 3 will similarly have the Charm available for the max number of available Pokemon, but will be much easier to get since the player should naturally be in the mid-60s by the end of Part 3 and better grinding areas are available.
I've been toying around with a new shiny hunting method that would be unique to Blooming Beast, but that would probably be introduced in Part 4.
Right now I'm aiming for late December, but that might be a bit too optimistic. I post updates and sneak peeks regularly on our Discord server, if you'd be interested in joining: https://discord.gg/2FUqPaSvfs
So they attacked repeatedly on the same turn and then stopped once your Furret fainted? Did you give it a Rocky Helmet? I've had issues with contact-related effects before, If not, please let me know your Furret's full moveset.
Thanks for reporting this issue. I'm glad you're enjoying the game otherwise :)