Pokémon/Pokédex/Dewgong

TM/HM

 * RB/Y/GS/C/RS/FL: Blizzard, Double Team, Hyper Beam, Rest, Surf, Toxic
 * RB/Y/C/RS/FL: Ice Beam
 * GS/C/RS/FL: Attract, Frustration, Hidden Power, Protect, Rain Dance, Return, Waterfall
 * RB/Y: Bide, Body Slam, Bubblebeam, Double-Edge, Horn Drill, Mimic, Pay Day, Rage, Skull Bash, Strength, Substitute, Take Down, Water Gun
 * GS/C: Curse, Endure, Headbutt, Icy Wind, Sleep Talk, Snore, Swagger, Whirlpool
 * RS/FL: Dive, Facade, Hail, Safeguard, Secret Power, Thief, Water Pulse

Evolution

 * GS/C/RS/FL: Disable, Encore, Lick, Perish Song, Slam
 * GS/C: Peck
 * RS/FL: Fake Out, Horn Drill, Icicle Spear

Trading Cards

 * Base Set #25 - Dewgong
 * Gym Challenge #54 - Misty's Dewgong
 * Neo Destiny #42 - Light Dewgong
 * Skyridge #H6 - Dewgong
 * Skyridge #7 - Dewgong
 * EX FireRed & LeafGreen #3 - Dewgong