You have to play the game twice to see everything. Choosing the "Solar Guild" vs. the "Lunar Coven" changes four towns, three gym leaders, and the final boss’s Pokémon.
You might be wondering, "There are thousands of GBA hacks. Why this one?" pokemon solar light and lunar dark download gba rom
: Simply download the ZIP file, extract it, and run the Game.exe file. No emulator is required for Windows. You have to play the game twice to see everything
The original project thread with patch notes. three gym leaders