>>57543102there was obviously the Lumiose glitch, there were also multiple glitches involving signs either not showing the right text or still showing the text even after you've looked away.
Invisible Poké Ball glitch
During the fifth chapter of the Looker Bureau missions in Lumiose City, the player is required to enter the room containing the stolen Poké Balls that are held within the Secret Lab of Lysandre Labs. In the upper-left corner, there is a table with a chair and two of the stolen Poké Balls nearby surrounding a second chair. If the player interacts with the table on its right or while sitting down, the game will trigger the "It's someone's Poké Ball." message despite there being no Poké Ball on the table. Returning to the room after the chapter is over will not display the message if the table is interacted with again.
Multiple music glitches, like route music looping incorrectly or the Pokéradar playing the wrong music.
There's also a handful of collision glitches, such as one where you can trick the game into letting you stepping through them.
Also it's still discussed to this day whether or not the albino glitch was real or not.
