I dunno if it's near the end of the series yet..
Poke'mon has been around for a long time, and the side characters keep changing. However, there are 5 characters who have remained throughout the series... Ash, Pikachu, and the Team Rocket Trio of Jessie James and Meowth. I think it would be cool if Jessie and James left team rocket, and James became a Poke'mon master. Imagine this... It's near the end of the series, and Ash is finally getting close to becoming a Poke'mon master. He faces all sorts of different challenges, and one of his last would be to face the current grand champion... James. After not being in the anime very much for a while James would reappear as a true Poke'mon master, and Ash would have to face him to achieve his ultimate goal muahaha.
I dunno if it's near the end of the series yet..
It isn't.
And this idea would NEVER happen.
A good ending for Ash? In the anime! Unthinkable!