These ganeshark codes are by Gameshark.com
Pokemon Puzzle Challenge

Stop Timer 91006bc8
Max Score 913f42c8
914243c8
910f44c8
Level Modifier Replace xx with: 01 thru 3201xxfdde
Game Speed Modifier (The Rate The Pieces Move) Replace xx with: 00 (Doesn't Move At All) thru 63 (Insanely Fast)91xxa6ce