Downloading and installing Pokémon Indigo League on Android is relatively straightforward. You can find the game on various websites that offer GBA ROMs, such as Romhacking or GameFAQs. However, be aware that downloading ROMs may be against the terms of service of some websites, and users should ensure they're downloading from reputable sources.
Go to the Google Play Store and download a trusted GBA emulator. My Boy! (Free version works fine, but the paid version has save states) is the most popular. Avoid emulators that ask for unnecessary permissions like access to your contacts. pokemon indigo league gba download for android