I just want to say in regards to my 4 “main” (haha haven’t actually got past chapter 1 in Mach Speed or Heroes of Paldea) fanfics, how close to SV canon they are (spoilers for the eventual Paldea arc of Adventures in the Pokémon Universe and potential spoilers for Temporal Boost below cut)
Mach Speed isn’t officially a Pokémon fanfic (Mewtwo gets mentioned a few times but only because of Smash)
Heroes of Paldea ironically strays so far from the main storyline who knows how canon-compliant it is
Adventures in the Pokémon Universe is going to be as canon-compliant as possible (while splitting quests (eg the three storylines in Scarlet and Violet) between the gang, also there will be less of a focus on school in the Paldea arc, including the Indigo Disk subarc) and for storylines that are different between versions (or if there’s some big difference depending on which clan you side with in PLA that happens to be close enough to what’s going on in the Hisuian subarc (yeah chances are this subarc may be quite canon-divergent, at least with my current plans)) I’ll try and take the Emerald route (include both if possible with a compromise of some kind)
Temporal Boost is more self-fanservice and almost certainly won’t be canon-compliant