: Access to a library of over 900 GBC-exclusive titles , in addition to the original Game Boy’s catalog of 1,000+ games.
Typing that phrase into the search bar reveals a landscape of "No-Intro" sets, "Full Collections," and "202X Packs." These aren't official Nintendo servers; they are preservation efforts (and sometimes glorified zip files) uploaded by enthusiasts. gameboy color rom collection archive.org
If you are looking for specific heavy hitters often found in these archives: : The definitive GBC RPG. The Legend of Zelda: Oracle of Ages/Seasons : Access to a library of over 900