Rendolf

You can get a Shinx fairly easily from the Onyx Game Corner

Both are first available in Tanzan Cove, Mantyke after visiting Spinel Town and getting the Good Rod. This is a little while after you get your 5th badge and right before you get your 6th.

Empoleon has always been my favorite!

I would agree with this except swapping Meowstic for Swampert, it's your only ground type and psychic is already covered by Metagross, plus water/ground is a pretty great typing. Actually, it might kind of depend on which gender Meowstic your's is, since one is a bit more useful than the other.

I got ~83% for most of them, almost all of them for the last one. I've allocated a significant amount of my brain cells to this game lol

There's a wiki that has most of the info: https://pokemon-reborn.fandom.com/wiki/Home The moves they can learn are generally based on their Gen 7 movesets so you can find that on Bulbapedia.

You don't gain access to the place that you evolve Magneton into Magnezone until after you get your 8th badge, so if you wanted one you'd need to get it fully evolved already.

I've found that there are not a lot of good early game Special Attack places, your best bet would probably be Obsidia Park in the morning (20% for Oddish, 9% for Sunflora), but like I said it's not very good. What I usually do though is give the Pokemon that needs Special Attack a Power Lens while I'm training against things that give the other stat I need, like Noibats/Stunky/Woobat in the Underground Railnet for Speed or Caterpie/Wurmple in Seacrest's garden (ideally during midday) for HP.

As you can see by looking at the top left corner of this page, Reborn's signature colors are blue, red, green, and purple. That theme appears in a ton of places throughout the game. You find out why from the story before your fourth gym battle, if you haven't already gotten there.

Alright then I'm pretty sure that there isn't another way to get one besides trading.

Did you go to the totem pole while the weather was clear and while you don't have an Ill-Fated Doll in your bag? If it's any other weather or you're holding a doll then the Natu won't appear on top of the pole.

You can get Tyrunt's fossil by giving a Farfetch'd, then a Pidgeot, and then Helix Fossils to the Helix Cult guy in 7th Street (each give you can choose between Jaw and Sail Fossils). Lileep's is only from mining though.

Did you give Archer an App from Silph Co., just to confirm?

Once you get a Good Rod you can get a Carvanha even if you don't join Aqua Gang.

I'm pretty sure they don't stack. IIRC there are 2 available because one of them is available earlier but from a sidequest that can be missed or something like that.

I did a Mono-Steel not too long ago and I remember I also had trouble with Shade, but I don't fully remember what my winning strategy ended up being (although I can say I did get lucky with a Pawniard). Now that I think about it, if you can get the lights on then Klang's Gear Grind does double damage and Automatize gets a boost, so you can try sweeping with those. Shift Gear would get a boost too, but you won't learn it for a pretty long time so that's too bad.

Press A or whatever your Bag Sort button is, Arc tells you that when you first enter Devon.

Gen 6 and earlier EVs were actually capped at 255 per stat, but they changed it to 252 in Gen 7 since those last 3 don't really help with anything.

Alright, I was just making sure you knew about Blast Powder when you said that. In that case I believe someone would have to trade you those Pokemon or their fossils.

There isn't another way to get them besides mining, but when you are mining you can save before you start and reload the game if you don't find a fossil to try again. Also, if you don't know already, you can use Blast Powder (bought from 7th Street) to mine a second time on rocks that you've already mined once.

5% chance to find a wild Pichu or Pikachu in the grass/flowers on the roof of the Onyx apartment building.

The devs have actually finished Episode 19 itself and the postgame is all they have left to complete (which will be released along with E19 for various reasons). But it's also gonna be a pretty long time until they're done so it would be best to not get too anxious for it at this time.

I think the devs probably made it so that most of the really strong megas aren't available in Episode 18 intentionally. But of course it will probably become available once E19 comes out.

Anytime!

No, you can go back to Route 3 to catch the Starly line whenever you want.