Arbok first appeared in Pokémon Emergency! as an Ekans. Throwing their Poké Balls down from their Meowth balloon, Jessie and James used both it and James's Koffing to quickly overtake the defenseless ViridianPokémon Center. Koffing's job was to create a Smokescreen while Ekans destroyed the computers. Chasing Ash, Misty and Nurse Joy, Ekans scared all of Ash's Pokémon, and Misty attempt with Goldeen was a flop. Though Nurse Joy's Pikachu came out and replenished Ash's Pikachu with a Thunder Shock attack, while at the same time attacking the Rocket trio. Giving Ash's Pikachu enough power to stand up, Ash charged up Pikachu using Misty's charred bike, and he let him have his own Thunder Shock. As Team Rocket were being electrocuted, Koffing's Smog was ignited by the voltage, causing the entire Pokémon Center to explode, and sending Team Rocket blasting off.
While the St. Anne had already sunk into the ocean, Ekans was responsible for the vessel flooding with seawater as Jessie ordered it to open a hole in the floor to escape in Pokémon Shipwreck. Team Rocket and the group later escaped thanks to their Water Pokémon.
Arbok and Jessie
It was used constantly by Jessie and eventually evolved into an Arbok in the episode Dig Those Diglett! along with James's Koffing after Jessie and James desperately wanted their Pokémon to evolve.
In The Whistle Stop, when Team Rocket stole a whistle from Arielle, Meowth blew it in the right note to cause Arbok to dance around and cry out in reaction. This gave Meowth a chance to command it to help capture a group of Ledyba from Arielle by having it dig underground and jump out in front of them for Meowth to throw a net on them and tie them in ropes. When they tried to escape, Arbok uses its tail to grab the ropes, but the Ladyba eventually escaped and dragged Arbok into Jessie's Lickitung and James' Victreebel, who were attacking the twerps and Arielle.
In A Poached Ego!, Team Rocket took on Rico, a Pokémon poacher who had captured a herd of Ekans and Koffing in Petalburg Forest. Arbok took on Rico's Fearow and managed to hold its beak shut, leading Rico to recall it. In the follow up match, Arbok knocked Fearow out with a Headbutt, allowing Meowth to free the captive Pokémon. James and Jessie reluctantly ordered Weezing and Arbok to stay in the wild and guard the young Ekans and Koffing. The pair tearfully escaped into the wilderness as Jessie, James and Meowth fought Rico and his Tyranitar.
Personality and characteristics
Jessie often relied on Arbok in battle because of its intimidating nature. Arbok's abilities to Dig underground and swim in the water like in The Misty Mermaid, made it an incredibly adaptable foe. Its deadly jaws and Wrap attack added to its ruthless battle style.
Arbok was deeply attached and loyal to Jessie as revealed during its temporary separation in Island of the Giant Pokémon, and its later release in A Poached Ego!. Jessie offered Arbok support in times of difficulty, like during blastoffs or when it failed its movie audition in Lights, Camera, Quacktion. Ekans and James's Koffing revealed in Island of the Giant Pokémon that there is no such thing as an evil Pokémon, rather that moral responsibility lies with the Trainer. The only time Arbok and Weezing refused to obey their Trainers was in A Chansey Operation, where they refused to attack a Chansey, because it had cared for their injuries that had been caused from Team Rocket's schemes.
A † shows that the move was used recently, unless all moves fit this case or there are fewer than five known moves.
Jessilina and her Arbok-shaped flute
Arbok's arrow-like pattern on its neck differs in some episodes. Sometimes, the ends of the arrow stretch until the ends of its eye-like patterns on its chest and is only a few inches wide. Similarly, there are two red dots on its arrow in some episodes and in other episodes there are none.
In The Misty Mermaid, Jessie's Arbok was shown to be able to swim without the need for air.
Its gender was hinted in the Japanese version of Island of the Giant Pokémon. In the subtitles, it refers to itself and Koffing as おれたち ore-tachi, which is a pronoun normally used by males meaning "we", also used by characters such as Ash, Brock and James in the Japanese version.
Out of all the Pokémon ever owned by Jessie or James, Arbok has used the most moves, with eleven.
For more information on this Pokémon's species, see Ekans and Arbok.