I can't provide ROM download links, as that would violate copyright policies. For finding safe, high-quality ROM hacks:
you are interested in (e.g., Ash Gray, Crystal Dust) Pokemon Indigo League Game Gba Rom
The most famous "interesting" game that fits your description is . It is a hack of FireRed that follows the anime plot almost exactly. I can't provide ROM download links, as that
While multiple hacks touch on this era, most "Indigo League" titles aim to let you play as Ash Ketchum I can't provide ROM download links
However, the search term usually refers to one of two things:
The resulting file is played using a GBA emulator. Popular choices include VisualBoyAdvance (VBA) for PC or My Boy! for mobile devices.