Indigo League is the name of the season, not a specific video game. If you download a file with that exact name, one of two things is happening:
Don't fall for fake "Indigo League" downloads. Pokemon Indigo League Game Gba Rom Download
fan game offers a nostalgic trip back to where it all began. Unlike the standard Kanto games, this fan-made project focuses on recreating the specific events and atmosphere of the original anime season. What is the Pokémon Indigo League Game? Indigo League is the name of the season,
: Custom sprites allow you to play as the iconic protagonist. No HMs Required Unlike the standard Kanto games, this fan-made project
(The Kanto Region) : While not titled "Indigo League," this is the official GBA remake of the original games that take place during the Indigo League era. Pokémon Shiny Gold Sigma
A: Yes, but do not change the ROM file name after starting a save, or the emulator may fail to read the .sav file.
Since you are searching for a GBA ROM, you likely already have an emulator set up. But if you are new, here is a quick, safe workflow.