you cant get him. Sure you can get him go to the route next to the pkmn league and yuse pokeradar in the big grass.
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.
how do you find a male houndour in pokemon platinum
No, you cannot find a Charizard in Pokémon Platinum, in order to get a Charizard in Platinum, you would have to trade for it or migrate it from a Gameboy Advanced game.
Gamestop(:(:(:(:(:(:(:(:
you can find them whilst surfing in route 225 on pearl, i don't think you can get them on platinum.