emeralds.7z is the name of one of the leaked archives from the Zammis Clark Breach. It was leaked on September 2, 2020, on the 4chan board /ppg/.
Contents of the Archive
The archive contained Pokémon Emerald's full localization source code, as well as ATI's Wii source tree (including full hardware source code and the Wii Startup Disc's partition data.
Pokémon Emerald Source Code
The Pokémon Emerald localization source code also included a map editor, which had been circulating 4chan prior to the leak in the form of a screenshot, which was proven genuine by the leak.