You have to defeat team galactia in mt cornet and then the man guarding the route to sunnyshore goes.
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No you cannot go to other regions in Pokemon Pearl or Diamond version but in Pokemon Heart Gold and Soul Silver you can go to the Jotoh region.
you go to solance town
No you cant catch one alone with no other game but if you have ruby insert it into the ds with Pokemon pearl and go on Pokemon pearl and go to Route 203 or Route 204 after obtaining the national pokedex. (Rudy game inserted)
Sorry, but you can't get Pearl or Diamond for your computer. But, go to Pokemon Crater dot com (pokemoncrater.com) for a cool game like Pearl or Diamond.
Go underground and dig.