you cand find the in sendoff spring in between level 40 to 42
You can find dusclops in turn back cave.
You can get it by link trade or you can find it in sendoff spring which you can only get to after catching o battling Giratina
There is no 'platnium', but you can find it on wild pokemon.
You can't find Registeel in Pokemon Platnium. You just migrate it in Pokemon Ruby, Pokemon Sapphire, and Pokemon Emerald.
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you find them on route 224
Go to rout 224 and use the pokeradar that's how i got my dusclops.
Dusclops is a Ghost type pokemon.
in girantinas cave
in the trophey garden
Honey Trees
No, you'll have to trade it from Platnium. Which in Platnium you find it in the Rock Peak Ruins.