Charizard's Island
Pokémon site with Gameshark codes and hints for Yellow and Red/Blue.
Cubone and Onix Pokemon Site
Offers cheats, tips, and points out glitches.
Game Boy Pokemon: Blue Edition MegaPage
Offering cheats, Gameshark codes, and hints for Pokémon Blue.
Gamewinners - Pokemon Red, Blue, and Yellow Versio
Offers hints and game tips.
PokéLand
Containing information on Pokemon Yellow Version. Includes cheats, pictures, walkthroughs, and links.
Pokémon Cheats
A site that has a codes for pokemon red, blue and some on yellow.
Pokemon Codes for Red/Blue/Yellow
Gameboy site, with rumors on how to get Pikablu (Marill), Mewthree, and Mew. It also contains other cheats, including the Cinnabar Island cheat and cloning Pokémon.
Pokemon Masters
Offers information on glitches, hints, and GameShark codes.
Supercheats.com Pokemon Blue
Cheats, hints, and tips for Pokemon Blue for the Gameboy.
Yuri's Pokemon site
Cheats, tips and tricks for pokemon yellow, red, or blue.