Pokemon Black Version 2 Cheats :
In order to get Heatran you must first defeat the Elite four and obtain the Magma stone.Go to Nuvema Town and surf towards Route 18.
Once there,go to the end and climb the stairs to reach a veteran trainer.You'll find a Pokeball near him containing the Magma stone.
Now,fly to Lentimas Town and enter Reversal Mountain.Once there,just follow the road going straight down till you reach a passage near a doctor.
Go inside the passage and run to the center.The Magma stone in your backpack will react to it and you'll see Heatran falling down.It will be at lvl 68.