Pokémon/Pokédex/Shellder

TM/HM

 * RB/Y/GS/C/RS/FL: Blizzard, Double Team, Rest, Surf, Toxic
 * RB/Y/C/RS/FL: Ice Beam
 * RB/Y/GS/C: Swift
 * GS/C/RS/FL: Attract, Frustration, Hidden Power, Protect, Rain Dance, Return
 * RB/Y: Bide, Bubblebeam, Double-Edge, Explosion, Mimic, Rage, Reflect, Selfdestruct, Substitute, Take Down, Teleport, Tri Attack, Water Gun
 * GS/C: Curse, Endure, Icy Wind, Sleep Talk, Snore, Swagger, Whirlpool
 * RS/FL: Dive, Facade, Hail, Secret Power, Water Pulse

Breeding

 * GS/C/RS/FL: Barrier, Bubblebeam, Rapid Spin, Screech, Take Down
 * RS/FL: Icicle Spear

Trading Cards

 * Fossil #54 - Shellder
 * Gym Heroes #89 - Misty's Shellder
 * Expedition #129 - Shellder
 * EX FireRed & LeafGreen #79 - Shellder