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It might not have been the best for any actual training, but I always found myself going back to Route 212 to face the Socialite and Gentleman that were there. If they were both willing to have a rematch and your Pokemon was holding an Amulet Coin, you could make over $50000 every two battles.
The one place I didn't enjoy training was in Victory Road. It's the only Victory Road that I can ever recall getting frustrated trying to go through, and even though I don't think you can re-battle anyone later on, I never even went back to find out.
On Platinum, the place I loved to train my Torterra and Staraptor in was the Restaurant near Pastoria City. They were richies, and it was double battles, so epic!
Victory road always made me rage. Its confusing, stupid, unoriginal, and the pokemon there appear every 5 steps you take, as well as these %#€!@ trainers. And when you have a repel left, its wasted in walking around finding an exit.