"he would not fucking say that" submas tier list, because canon is in itself a complicated construct
a.k.a. there are way too many continuities (4 main categories - mainline games, masters, anime, manga) so it gets confusing real quick. here's just some non-exhaustive rambles. the point is just that the distinction even has to exist. no tier is inherently good or bad.
tier 1: actually happens across all continuities
ingo loves trains, emmet loves battling
tier 2: only shown onscreen in 1 / some continuities, but is extremely plausible for the rest
ingo's ace is his chandelure (LA, masters, anime) and emmet's is his eelektross (masters, anime, technically BW if you count it being his exclusive mon for all his super lines battles)
emmet idolises ingo quite a fair bit (anime, masters)
elesa being besties with the twins (masters)
tier 3: only actually happened in 1 continuity, but would be out of place for other continuities
manga emmet Just Saying Things
the whole plot of legends: arceus kinda? ingo seems fine in the anime (where LA doesn't seem to have a full equivalent), he'll never return in the manga, masters hasn't touched on it
tier 3.5: only happened in 1 language, other languages don't have that part
spanish (was it specifically LatAm dub?) anime ingo swearing
tier 4: headcanon extremely plausible for all continuities, but never actually confirmed
autistic / neurodivergent in some way submas
ingo being a bona fide Railfan (like the fanbase)
tier 5: headcanon plausible for only 1 continuity, but less so for the rest
emmet breeding joltik probably goes here. cross poison galvantula being in the game inherently makes it plausible for game canon but nowhere else is he mentioned to have a galvantula to even begin with. was debating on whether to put this in the tier below because he technically didn't have to breed, he could've just traded.
tier 6: We Made It The Fuck Up
i'm sorry but... ingo adopting LA protag