I have been rewatching Pokemon lately, random episodes that play on TV. It is always shown that Jessie & James from Team Rocket fail to capture Ash's Pikachu or their attempts in kidnapping other Pokemon are thwarted by Ash and team.
Since the Pokemon animated series is purely focused on adventures of Ash and team, we rarely see any focus on other characters, Jessie and James included. Yes, there are few episodes which explore their backgrounds and history, but again it involves Ash and team in some manner.
Now any organization/syndicate in any world if it finds a high failure rate among certain field agents, they will either terminate their employment or withdraw them from field activities. But even after failing so many times against Ash and team, Jessie and James are part of Team Rockets operations. Plus, they get those high end gadgets to meet their objectives. Yes, they are shown doing random odd jobs to raise money, but I don't think it must be giving enough money to build high end weapons. Also, most of their odd jobs revolve around getting close to rare Pokemon and kidnapping them.
So what I was thinking was, in the periods between Jessie and James' encounters with Ash and team, they must be kidnapping various Pokemon successfully. It's just that they are unable to defeat Ash and team. Is there any proof to this?