Yes you can. Go right from Mauville, surf across. Go right a bit then go up. There should be a MASSIVE place where you can't even see the people's heads. Walk around and you should find Tropius.
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Try catch a Tropius, some of them hold miracle seed.
You can get Tropius in Heart Gold by the Pokewalker Tree House Routw or trade it from Saphire, Ruby or Emerald. Hop this helps :)
I'm sorry to disappoint you, but tropius can only be obtained by trade in pearl. There is another method and that is to transfer a tropius through a gba game such as emerald, ruby or sapphire.
You can't it is a hoenn Pokemon you have to trade with somebody who has a Pokemon emerald, Sapphire or ruby game card or you can get it by using gameshark codes...
no