You can only find misdreavus on Pokemon pearl at the lost tower and eterna forest
You could also migrate one from Pokemon sapphire, ruby or emerald
in the forest
you can only find that pokemnon in pearl version sorry
lots of people have them but the most obvious place to see on is in the 5th gym by battling the people one the way to the gym leader
murkrow and misdreavius are the only two tha i know of.
Ash is not in platinum..
You cannot find Lugia in Pokémon Platinum.
You can't find Vibrava on Pokémon Platinum
To find a shiny stone in platinum you have to dig in the underground tunnel.
You can find exeggcute in the Great Marsh in Pastoria City
no you can't find a torchic egg in Pokemon platinum
You cannot find Lugia in Pokémon Platinum.
It's impossible to find Mewtwo in Platinum.