GamerU lists the location and requirements for obtaining every Mega Stone in Omega Ruby and Alpha Sapphire.
The original names of Pokémon Ruby and Sapphire have allegedly been uncovered, with the old names sounding pretty familiar.
From Nintendo Life: "It's time to dust off your 3DS and your copy of Pokémon Omega Ruby and Alpha Sapphire, because people have been reporting that their cartridges are no longer working, almost seven years after the release of the game.
A few people on Reddit and ResetEra are making sure to test their copies, and it seems like only the PAL version is affected, although it's not clear what might have caused the issue yet."
KeenGamer: "The Nintendo 3DS is officially ten years old, so we thought it would be a great time to highlight the best games on the console. The last dedicated handheld by Nintendo was a unique device that provided many incredible and unquestionably great experiences."
Swap OoT for Majoras Mask and Pokemon for Xenoblade Chronicles and you might be on to something with this list.