How do you get to the Battleground on Diamond?

Answer 1

first of all, you must mean by the survival area. try every path up or that might get u there. you have 2 complete the sinnoh dex then u can get to stark mountain. find the cavern in the back. thier should be a red-orange man named buck. he'll leve with something. go to the house in survival area and buck will return somthing 2 the montain, go back and find heatran as a bonus. the other mountain has either dialga, palkia, or giratina and in platinum u can get all 3!!!!!!!!!!!

Answer 2

You have to get a national pokedex first by seeing all the Pokemon in sinnoh.

If you have seen all the Pokemon in sinnoh then go to professor Rowan

Answer 3

The Battleground is available only on Pokémon Platinum.