Pokemon Diamond Training?

Question

Where is the best place to train in Pokemon Diamond/Pearl? (I have allready beat the elite four over 50 times, so I'm getting tired of training there.) So what is another good place to train Pokemon of high levels. Highest level Pokemon wins best answer.

Answer 1

Stark mountain or the routes near the fight area,resort area etc.

Answer 2

The desert area near stark mountain or the area surrounding and in stark mountain itself. The three trainers at the top of the route near the exit/entrance. The pokemon are usually in the mid to upper 50's in level. And the trainers give lots of exp.