>>29676394Well, Team Rocket declared that Giovanni was their leader in two whole regions, so I would say he was pretty well known.
>as the events contradict nothingBut it does. If you count FRLG post-game as canon, then Red defeated/caught Mewtwo. But in HGSS postgame, Mewtwo is still there. Or the Volcarona in BW. If Hilbert had explored the Relic Castle, he would've encountered it. But it's still there in BW2.
The story of Ethan ended right when he beat Lance. Everything else is just a way to let the player, you, know what happened to the cast of previous games. You can consider the anything you learn true, but Ethan just wasn't there. Blue is still a Gym Leader, just that Ethan didn't canonically beat him.
And I'm not pulling this out of my ass. In BW, you can learn the story and location of Kyurem. That is canon. Proven in BW2, when Kyurem is found in the same area again, this time during the main game. The information we got was true. But Hilbert wasn't there. He would've caught it otherwise.
Postgame can add a lot the lore of the world, but it isn't the protagonist experiencing the postgame content. Postgame is made with the player in mind, only the player in mind. If that wasn't the case, the game would be full of contradictions.