Pokemon diamond? ok so im looking for a ditto to breed my pokemon with but i cant find one is there even one in pokemon diamond if not i could give u my Rampardos lvl 55 for it and ditto idc what lvl it is and im alredy on waiting give me ur fc and name my name is max and fc is 2621 1731 9803 im alredy on teh wifi conector so hurry.

Ok follow this steps:
1.Get a National DEX (if you don't have one)
2.Get a pokeradar (again if you don't have one)
3.Go to route 218 (Near Canalave City).
4.Get on a grass patch.
5.Use pokeradar and if you are lucky you'll catch one.
PS:There are not rare but there are uncommon so keep trying you should be able to find one