No unfortunately you have to trade some Pokemon for them to evolve so you need some one with pokemon crystal, sliver, or gold to trade with.
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Catch 'em all
You can not catch any of them in black or white, but I think that you can catch all 3 in diamond.
you can catch water Pokemon by surfing on water and by using all the rods
no but if you catch all the hoenn pokemon you can catch jotho and kanto pokemon
catch all 150 original Pokemon i believe if not its you have to catch all of them from the hoen region too