Pokemon: Emerald Version (GBA)

Credit to: ROMS Games
Pokémon Emerald Version is a sister game to Pokémon Ruby and Sapphire. Emerald Version provided the main storyline with more depth and length, as well as making small aesthetic changes to the world and adding unique animations for each Pokémon.Download Instructions:Controls and Help for GBA issues
Controls
the controls should be the up/down/left/right arrow keys, alongside "Z" and "X" for the A and B controls. You can change your controls via emulator.
GBA issues
If you get just a white screen, do Options>Emulator>Save Type and change it from Flash64K to Flash128K (credit goes to some other commenter)
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when you open the emulator, before loading your game for the first time, click options>emulator>real time clock This should allow for berries to grow over time, trainers to rebattle you after a while, etc.Requirements: a Virtual Game Boy Advance