How do you evolve rhydon without trading in Pokemon diamond?

Answer 1

it is simple you have to give it a ground stone which makes it evolve this is only found when you give a ground type pokemon a king stone and leave it in a drycare centre because of the ground type pokemon the kings rock get converted into ground stone and give rhydon it and it will evolve 100 % but to get ground stone you must rember that ( 1) the pokemon should be a ground type pokemon only (2) leave ground type pokemon with rhydon so that the king rock can get converted into ground stone (3) ground stone give it to rhydon and let him have 94 battles and it will evolve deu to increase pressure on his body he should not go to pokemon centre to recover or give him any thing if you give an item that will recover him he will not evolve and you have to start over again so be sure to evolve into a powerfull pokemon and good luck