James's Weezing (Japanese: コジロウのマタドガスKojirō's Matadogas) was the first PokémonJames was known to have, and his third overall. He received it as a Christmas gift (a year-end gift in the original Japanese version).
Weezing first appeared in Pokémon Emergency! as a Koffing. James used it alongside Jessie's Ekans to quickly overtake the defenseless ViridianPokémon Center. Koffing's job was to create a Smokescreen while Ekans destroyed the computers. Chasing everyone into the back room, Koffing and Ekans accompanied their Trainers in intimidating Ash, Misty and Nurse Joy, which caused Misty to decide to battle Team Rocket. This was a failed effort, however, as both of them managed to catch up to Ash in no time at all. However, Nurse Joy's Pikachu came out and healed Ash's Pikachu with a Thunder Shock attack, while at the same time attacking the Team Rocket trio. Giving Ash's Pikachu enough power to stand up, Ash charged up Pikachu using Misty's charred bike, and he let him use his own Thunder Shock. As the group were electrocuted, Koffing used Smog, and the electricity climbed up the toxic gas, causing the entire Pokémon Center to explode, and sending Team Rocket blasting off for the first time.
Weezing and James
It was used constantly by James as his main battling Pokémon throughout Kanto and eventually evolved into a Weezing in Dig Those Diglett!, along with Ekans, after James and Jessie were desperate for them to evolve.
Weezing assisted James in catching his Weepinbell. In The Evolution Solution, James also used Weezing to battle a Shellder he dug up. Weezing was easily able to defeat it with its Haze attack after dodging its Ice Beam. Just as James was about to catch it, Jessie jumped in and caught it herself.
Throughout the Johto region, James tended to use Victreebel more for combat than Weezing. During this time, Weezing was mainly used to create smoke to cover the trio's escapes and entrances.
In A Poached Ego!, Team Rocket took on Rico, a Pokémon poacher who had captured a herd of Ekans and Koffing in Petalburg Forest. After freeing them, James and Jessie reluctantly ordered Weezing and Arbok to stay in the wild and guard their fellow Pokémon. Arbok and Weezing followed orders, tearing up as they watched the trio take on Rico's Tyranitar. James said that "Weezing and I are like brothers," indicating a great bond between the two.
Personality and characteristics
Weezing fighting alongside Arbok
Weezing was extremely loyal to James, caring about him a great deal and only taking orders from him. In Island of the Giant Pokémon, as a Koffing, it refused to attack Ash's Pokémon on Meowth's orders, simply because he was not James. Both Koffing and Ekans were very sad about being separated from their Trainers, and were happily crying upon being reunited with them. Koffing also 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. In Dig Those Diglett!, Koffing's evolution into Weezing was triggered simply by James's emotional tears. The only time Weezing refused to obey its Trainer was in A Chansey Operation, because the Chansey aided its recovery following a failed Team Rocket scheme, demonstrating its gratitude can extend to anyone who helps it.
Weezing and Arbok, even prior to their evolutions, proved to be a deadly duo. In The Flame Pokémon-athon!, Weezing defended Arbok after it was injured by a Ponyta's flames and retaliating with Smog, even though this proved to be a bad idea when the flames ignited the Smog. Weezing often provided the Smokescreen for Team Rocket's grand entrances and escapes. Its Sludge attack was also used to blind the twerps Pokémon like in Ash Catches a Pokémon.
A † shows that the move was used recently, unless all moves fit this case or there are fewer than five known moves.
In The Misty Mermaid, James's Weezing was shown as less dense than water, causing it to float.
Though Team Rocket began chasing Pikachu mainly because it was powerful enough to blow up the Pokémon Center, it should be noted that James's Koffing was part of the cause — its gas reacted with the electricity to create the explosion.