Pokémon/Pokédex/Tentacruel

TM/HM

 * RB/Y/GS/C/RS/FL: Blizzard, Cut, Double Team, Hyper Beam, 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

Evolution

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

Trading Cards
There is a total of four versions of Tentacruel in Pokémon Trading Card Game.

Fossil Edition
Uncommon card


 * Type: Water
 * Hit Points: 60
 * Weakness: Lightning
 * Resistance: None
 * Retreat Cost: None
 * Level: 21
 * Attacks:
 * Supersonic (1 Water Energy) - Flip a coin. If heads, the Defending Pokémon is now Confused.
 * Jellyfish Sting (2 Water Energy) - Does 10 damage. The Defending Pokémon is now Poisoned.

Gym Heroes Edition (Misty's Tentacruel)
Rare holographic card

Pokémon Power: Flee - If an attack does damage to Misty's Tentacruel while it's your Active Pokémon, you may switch it with 1 of your Benched Pokémon, which prevents all other effects of that attack on Misty's Tentacruel. This power can't be used if Misty's Tentacruel is already Asleep, Confused, or Paralyzed.


 * Type: Water
 * Hit Points: 70
 * Weakness: Lightning
 * Resistance: None
 * Retreat Cost: None
 * Level: 30
 * Attacks:
 * Jellyfish Poison (2 Water, 2 Colourless Energy) - Does 30 damage. Flip a coin. If heads, the Defending Pokémon is now Poisoned. If tails, the Defending Pokémon is now Confused.

Aquapolis Edition
Rare holographic card

Poké-Power: Strange Tentacles - Once during your turn (before your attack), as long as the number of Energy cards attached to the Defending Pokémon is less than the number of Energy cards attached to your Active Pokémon, you may choose an Energy card, if any, in your opponent's discard pile and attach it to the Defending Pokémon. This power can't be used if Tentacruel is affected by a Special Condition.


 * Type: Water
 * Hit Points: 70
 * Weakness: Lightning
 * Resistance: None
 * Retreat Cost: None
 * Level: X
 * Attacks:
 * Poison Sting (1 Water, 1 Colourless Energy) - Does 20 damage. Flip a coin. If heads, the Defending Pokémon is now Poisoned.

(Note: There exist two versions of this card, namely H26 and 38, with the same artwork and statistics; 38 is non-holographic)

EX Hidden Legends Edition
Uncommon card


 * Type: Water
 * Hit Points: 70
 * Weakness: Lightning
 * Resistance: None
 * Retreat Cost: None
 * Level: X
 * Attacks:
 * Long Tentacle (1 Colourless Energy) - Flip a coin. If heads, the Defending Pokémon is now Confused. If tails, discard an Energy card attached to the Defending Pokémon.
 * Toxic (2 Colourless Energy) - The Defending Pokémon is now Poisoned. Put 2 damage counters instead of 1 on the Defending Pokémon between turns.