Pokémon/Pokédex/Arbok

TM/HM

 * RB/Y/GS/C/RS/FL: Dig, Double Team, Earthquake, Hyper Beam, Rest, Strength, Toxic
 * GS/C/RS/FL: Attract, Frustration, Giga Drain, Hidden Power, Protect, Return, Sludge Bomb, Sunny Day, Thief
 * RB/Y: Bide, Body Slam, Double-Edge, Fissure, Mega Drain, Mimic, Rage, Rock Slide, Skull Bash, Substitute, Take Down
 * GS/C: Curse, Endure, Headbutt, Sleep Talk, Snore, Swagger
 * RS/FL: Facade, Iron Tail, Rain Dance, Secret Power, Snatch, Torment

Evolution

 * GS/C/RS/FL: Beat Up, Pursuit, Slam, Spite
 * RS/FL: Poison Fang
 * C: Crunch

Trading Cards

 * Team Rocket #2 - Dark Arbok
 * Team Rocket #10 - Dark Arbok
 * Gym Challenge #25 - Koga's Arbok
 * Expedition #3 - Arbok
 * Expedition #35 - Arbok
 * EX Sandstorm #29 - Arbok
 * EX Team Rocket Returns #29 - Dark Arbok

Eyespot Mimicry
Arbok possesses mimicry eyespots below its face. In real life eyespots are a phenomenon used by a variety of creatures for a variety of purposes, in this case to add intimidation to the creature.

Naming
Arbok spelled backwards is Kobra, fitting given the real life snake genus, the true cobra (Naja), shares some traits with Arbok.