Pokémon Indigo League is a ROM hack of the original Pokémon games, and it's not an official release. Also, Game Boy Advance (GBA) emulators are required to play GBA ROMs on Android.
: While it expands into multiple regions (like Johto and Hoenn), it begins with a polished version of the Kanto Indigo League. Safety and Legality Warning pokemon indigo league gba 2021 download for android