Pokémon/Pokédex/Tentacool

TM/HM

 * RB/Y/GS/C/RS/FL: Blizzard, Cut, Double Team, Rest, Surf, Toxic
 * RB/Y/C/RS/FL: Ice Beam
 * GS/C/RS/FL: Attract, Frustration, Giga Drain, Hidden Power, Protect, Rain Dance, Return, Sludge Bomb
 * RB/Y: Bide, Bubblebeam, Double-Edge, Mega Drain, Mimic, Rage, Reflect, Skull Bash, Substitute, Swords Dance, Take Down, Water Gun
 * GS/C: Curse, Endure, Icy Wind, Sleep Talk, Snore, Swagger, Whirlpool
 * RS/FL: Dive, Facade, Hail, Secret Power, Thief, Water Pulse, Waterfall

Breeding

 * GS/C/RS/FL: Aurora Beam, Haze, Mirror Coat, Rapid Spin, Safeguard
 * RS/FL: Confuse Ray

Trading Cards

 * Fossil #56 - Tentacool
 * Gym Heroes #32 - Misty's Tentacool
 * Gym Heroes #57 - Misty's Tentacool
 * Aquapolis #113 - Tentacool
 * EX Hidden Legends #77 - Tentacool