Really great resource for people who aren't as familiar with what everything does. There are however a few changes to the post that I would recommend.
Firstly, I would mention that the metagame is still fairly infantile and many things that you say are subject to change. This is primarily in response to when you say things like 'Usually seen with an item like Sitrus Berry', everything you say is true now but is likely to become outdated as the meta progresses.
I would somehow separate the more viable Pokemon from the less/unviable Pokemon. Having no separation between the 4 viable Intimidators and Granbull and Masquerain may be confusing for newer players. I know that you have lumped most of the viable Pokemon together and the less viable together, but it's difficult to tell where the viable stops and the less viable starts without having prior knowledge of the format.
I would clear up that Prankster Tailwind is unaffected by Psychic terrain, and dark types for the most part aren't all that common in the current meta considering the list of truly common darks kind of ends at Muk and Krook.
Exeggcutor doesn't get chlorophyll anymore and the fact that you can't get regular Exeggcutor means the '(both)' is unnecessary.
But yeah really great work. Honestly this would be a pretty great framework for a beginners guide to the meta, though I feel some Pokemon would need to be omitted (things like Ariados and Guzzlord for example) and some things would need to be included, things like the Tapus, Garchomp, viable UBs like Kartana and Xurkitree (even if its usage is dwindling), Muk, Mudsdale, Metagross, Milotic, Magnezone, Goodra, Gengar, Drampa and probably some other viable Pokemon that aren't mentioned already.