Platinum

[Soraboy7]

After u beat the elite 4 once, everyone gets to 60 and above where do you train ur Pokemon because stark mountain aint that good

 

[Faye Scarlet]

Just outside of Sunnyshore is where I get some good training, especially at night. There's two sailors, a tuber, and a policeman, with levels ranging from 40-60, I believe. At the end of that route by the lakefront, there's also a rich boy and a fisherman, with levels 60-70 as I recall.

I also go up to the resort area and battle those two ace trainers.

 

[PlatinumDude]

This could've gone to the Simple Questions thread in the Video Games section: http://bmgf.bulbagarden.net/showthread.php?t=19628

Anyway, did you catch/defeat Heatran yet? If you did, the Battleground in the Survival Area will open and you can challenge 3 random Gym Leaders plus someone you teamed up with in the past.

 

[GrnMarvl14]

Moving to the Video Games forum.

 

[Envoy]

Then there's of course the E4 themselves. In Platinum (and only in Platinum,) the E4/Champion's levels will increase after catching Heatran. Their Pokemon will range from level 65 to level 78 (Cynthia's Garchomp.) It's a great place for training if you don't mind the repetitiveness of it. Also, you can fight your rival every day of the weekend. His team will have Pokemon from level 79 (Roserade/Floatzel/Rapidash) to level 85 (Torterra/Infernape/Empoleon)