Isn't Pokejungle one of the least trustworthy Pokemon fansites?
4chan also leaked the Unova starter evolutions, Greninja, and Hawlucha before game release.
It's as trustworthy as any Fansite including Pokecommunity. IIRC 4chan also echoed what was posted from 2ch for most of their correct leaks. The media used isn't as important as the person who is providing the information. Outside of official media, everything should be taken as false anyway.
If the video I posted has any of them shown, Serebii who claims it as fake would be viewed in the same light. Pokejungle to the best of my knowledge is more relaxed about sharing information than other fan sites and they do their best to make in known that everything they share is unconfirmed, but that doesn't stop people from jumping to conclusions and then blaming PJ for any misinformation that appears. Serebii has made some errors in the past with translations that turned around to bite them before. They learned, they do more research now and make sure everything is as accurate as they can make it so that they don't fall into the media pitfall that PJ tends to allow themselves to fall into. So really, unless a site just doesn't care about what they post, they are all as trustworthy as anyone who receives information second hand.
Outside of our general Pokemon Media, 4chan is fairly well known to have people who have less than faithful reasons to mess with people. Information provided would fall under the poster as an individual, but it unlike fan sites aren't going to try and post things as accurately as possible and it is a well known media to post fake leaks. We've definitely had more fakes from 4chan than we've had accurate information. If the poster happens to be known and credible, even on 4chan, then the information can be credible as well.
This being said, both Serebii and PokeJungle's "Hoax" list is as credible as they can be for now. Until the actual release of the games any decent listing we get, even the one that had no starters, has potential to be real unless a creator comes forth and says otherwise.
The Owl from 2ch and the line sets in the video have about the same chances of being legit. I remember how almost all the outlets were saying the Gen 5 evolutions were fake because of the way they were propped. Then they were revealed to be real by an official source. There were heavily detailed posts and videos "proving" that Samurott, Emboar, and Serperior were fake and some had a very strong backing by the fans.
So my general view, enjoy what you see if you like it. It's all fake until proven to be real by Gamefreak, CoroCoro or Nintendo/TPC. No matter where it's from. If it's poorly drawn, it'll have less chance of being real, but that doesn't condemn it's potential. We can't nitpick everything.
EDIT: We do also still have people refusing to believe that Sun/Moon are Gen 7 as opposed to the 6.5 and are in ways discrediting Serebii and Bulbapedia for already labeling them as such. This is definitely a case of to each their own, but credit of fansites are only worth what we put into them. If their credit is worth so little to those who refuse to accept that these could be Gen 7, then how can they be deemed credible under any justifiable light? Put your belief into the groups you want to believe in and if they don't make a post about potential fakes, take it as you want it. It can have as much credit as you want to give it or as little credit as you want to give it.
