In my HC, Colosseum and XD are canon withing the main games, in fact, they are very important parts, because the battle frontier in Emerald is a prequel to Colosseum, Scott was actually searching for good trainers and powerful pokémon to steal and begin the shadow pokémon plot, thus, destroying the island, leaving Brendan in a comma and fleeing to Orre, Scott died in the explosion, but Cipher took on his job, the Absol, Flygon and Manectric you capture in Colosseum are Brendan's.
Brendan wakes up with amnesia and decides to challenge the region again, but now he has a cold heart and shit (This happens while Colosseum happens), also, this is parallel to Red's victory in Kanto, afterwards they all go to the Realga tower to participate and battle, but each one, Brendand, Red and Wes each have a legendary pokémon, Kyogre, Groudon and Rayquaza.
Years later, BW2 happens, Rosa is Brendan's daughter, but Colres and Ghetsis manages to awaken and unleash Kyurem's power, Colress being a faithful Cipher follower decides to unleash it's potential but Rosa manages to defeat him at the last minute, sadly, the universe resets itself after this, or so is thought...
XY protag is Red's alternate timeline counterpart (new universe), but it is revealed afterwards that he is in fact, Red's son and Diantha is Green (Kaz)'s daughter, the universe wasn't reset.
Gold/Silver is just a side story that tells the tales of what happenned to Ho-oh and Lugia after the events in Colosseum and XD when they go back to Johto.
D/P/P's protag is helped by Red during his journey since they are related, at the end, Red falls into the void of the Distortion word and is thought to be lost forever but he's teleported to Mt. Silver's summit, during this, the creation trio die, so that's why Gold in HG/SS could summon Arceus to revive them with the help of Cynthia.
Fuck it, you asked.
