I'll take this thread as a moment to mourn the loss of my Omega Ruby cartridge, dead for unknown reasons. It was once my main Pokémon cartridge, with me playing through it until the post game, unlocking everything and catching every poke, trying to get shiny legendaries for some cases. And with Sun and Moon's release, I still was booting it from time to time, if only to get that damn alternative Entei. But last day, as I tried to boot it, I met the fearful "An error happened, please shut down your 3DS" message, on both my pirated 2DS and my clean 3DS XL, and nothing saved it. I tried updating the game to various levels of updates. I tried copying the SD data somewhere else before formatting it, then putting it back on. I even went as far as formatting my 3DS XL. But nothing saved the poor cartridge, who ran for hundreds of hours until its end. Even 3DS cartridges aren't immortal, despite DS cartridges still functioning perfectly (I still have my day one Diamond version working perfectly), I guess. Be sure to keep a backup of your saves for this case, should this happen too.