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eLook: Pokemon Crystal Version
Quick summary of cheats and codes
http://www.elook.org/games/cheats/gbc/617.shtml

GameFAQs
Contains game information, FAQs, hints, and a message board.
http://www.gamefaqs.com/portable/gbcolor/game/375087.html

GameSpot
Contains cheats and codes, a review by Frank Provo, news, and screenshots.
http://www.gamespot.com/gbc/rpg/pokemoncrystal/

Pokemon Garden
Offers GameShark codes.
http://www.geocities.com/pgarden01/