It's episodes like this that made Pokemon good. Now every episode has the same basic plot.
1. Ash and co arive some place.
2. The make one or more friends for the episode who are never seen again.
3. An event happens, usually a battle or some guy has a problem.
4. Team Rocket interupts and say their motto.
5. They beat Team Rocket who blast off to some far place but come back.
6. The resolve the problem or don't even complete the battle and their friends forever however they're usually never seen or mentioned again.