Im not sure were it is but south a city there is a mansion with a prize garden and you have a 5% chance and on route 128(i think) if you have the pokeradar 25%. Plz improve on this answer if i got anything wrong or you can name something i didnt.
no ditto is there
In Pokemon PLatinum there r in pewter city
canalave city or the trophy garden.
on route 218 after you complete the sinnho dex
you must first have a national dex and then go to the Pokemon mansion and talk to the owner every day until he says he saw a ditto in the Pokemon garden
You can either leave 2 pokemon (Male and female, female with Ditto, male with Ditto) In the Daycare Center, or talk to the man near the East exit in Hearthome City. Hope this helps!
You can only catch ditto after you receive national dex. And it can only be caught in the Pokemon mansion on a certain day.P.s. save before you talk to mr.backlot and if the Pokemon mentioned is not what you want the turn off and on until he says the desired Pokemon.
in the trophy garden you can talk to mr. backlot and he'll tell you a story just keep answering yes then soon he'll tell you the Pokemon and if you're lucky it'll be a ditto but sometimes you can run into the ditto without it being the Pokemon mr. backlot told you lucky you!! =]
You can't find Registeel in Pokemon Platnium. You just migrate it in Pokemon Ruby, Pokemon Sapphire, and Pokemon Emerald.
There is no 'platnium', but you can find it on wild pokemon.
you cant catch it in platnium but you can trade it
the most wanted in this houshold is Pokemon platnium