It's super far off into the future. I found a log in the destroyed PokeMart in the Wastelands that was talking about CDs. I can't remember the exact wording but its was along the lines of "Since servers are failing all over the world and people still want to listen to music we're bringing back CDs to listen to music, something our Great-Great Grandparents used."

So, lets assume that Great-Great Grandparents were Red, Blue, Yellow, FireRed, LeafGreen generation. (So think like the main characters of those games.) So if they are the Great-Great Grandparents, and just giving a general age each generation had kids in their 30s. That's around 120 years right before all the humans left for space.

Then when you find the lore in the Skylands about how the earthquakes and what not after centuries Saffron will eventually be tall mountains (which they are when we as Ditto get to them) it's been centuries since the humans left. So with all that my first idea is Pokopia takes place 500-1000 years after the events of RBY/FrLg.

Second thing; a lot of people are assuming Professor Oak was Tangrowth's trainer. (I don't but to go off that theory) the destructive climate change had to happen right after Black 2 & White 2.

The mainline games are split into two timelines. Generation 1-5 takes place in the first timeline, Generation 6 and onwards takes place in the Mega timeline. When Az used the Ultimate Weapon, and the residual energy from the weapon being used cause Mega Evolutions, Z Moves, Dynamax, Terrastilization, etc. So this means Omega Ruby & Alpha Sapphire take place in the second timeline even though its a remake of Ruby/Sapphire/Emerald.

So RBY/FrLg take place at the same time as RSE, and alternatively GSC take place the same time as DPPl 3 years later. Then Black and White take place years after GSC/DPPl, and Black2 White2 take place 2 years after BW.

So if Tangrowth was Oak's Pokemon then the humans left for space right after either B2W2 or Wind & Waves, since it will most likely have a gimmick putting it in the Mega Timeline.

But the lore from the unnamed Professor imply that their grandchild that plays with Tangela is suuuuper young. So if that's referring to Blue (Oaks grandson) I don't know of any anime/manga/games of Blue playing with a Tangela, or Oak.

So I REALLY think it has been ~100 years since the events of RBY/FrLg when PokeEarth starts going wack and the humans book it to space.

Grady’s agent Kitty offers him to go stay in a cottage she inherited from a client for three months on a remote Scottish island, so he can write another book.

Without going into the WHOLE plot Turns out our friend Grady actually tried to kill Wife Abby the night she went missing, both Kitty and Abby used to live on Amberly the remote Scottish island, a whole lotta crap happened where Wife Abby thinks shes responsible for killing all the kids that lived on Amberly. Kitty was actually married to the client she inherited the cottage from, and this was all a plot to get Grady to the island that only women live on so he could write novels and give the money he earns from the sales of his novels to the island so they don’t have to have tourists come but for a couple of weeks a year (cause they hate tourists, especially men tourists) They offer Grady a deal to write, give them the money, and he gets to live.

Then they kill him anyways? That’s just how it ends. They kill him after this whole exposition dump and offering him a deal.

All in all I think the exposition dump at the end kinda took me out of it. And then Grady turning out to be a murderous husband cause he was the one that was laying in the road in the middle of the night.

There’s a whole lot of nothing that happens in the book as well. Its just Grady thinking he keeps seeing Abby every where then thinking hes just crazy, then back to seeing Abby. I mean yeah she is there, there was a whole plot to gas light him into thinking he didn’t see her and the whole island was into it. All the island residents keep walkie talkies to be able to talk to one another and Grady eventually steals one during the climax and hears a bit of the plot to make him think hes bananas.