>>33003252>Remember when Sycamore and his assistants said that the fairy typeWell do remember that in ORAS there were barely any Fairy-types in the dex to begin with, the only ones being the Azumarill line, Jigglypuff line, and Gardevoir/Gallade line, and Wally who's notorious for having Ralts as his starter, evolved Gardevoir into Gallade. It wasn't until XY where the type started showing up more and people started realizing it.
>Mega evolution was a mystery exclusive to KalosThis was retconned in ORAS and they explained it. Historically, Rayquaza was the first Pokemon to Mega Evolve due to eating the meteors from space, and said meteors landed in Hoenn, thousands of years ago, but the only people who know that are the Draconids.
The Ultimate Weapon created the Mega Stones of Kalos when it went into space 3000 years ago, which was around the same time Rayquaza stopped the meteor that would destroy earth. Since the only ones who know the tale about Rayquaza were the Draconids, the first Pokemon to evolve through a Mega Stone was Korrina and Gurkinn's ancestor's Lucario according to Kalos lore and that is what everyone was taught to believe.
The only reason Mega Evolution is still a mystery by the time XY comes around is because the only ones who had it were Steven, Wally, the player, the player's friend, Zinnia, the E4, and Lisia who only ever used it if you challenged her in the Master Rank. So that's it, a select few of people actually even know the thing exists.
Cue 8 years later and more people are starting to learn about it, more research is being done, and Professor Sycamore can finally hire assistants to do research first hand.
Retconning is total bullshit but at least there aren't jarring plotholes.