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You can't catch any of Slowking's line in Hoenn. You must trade it from LG.
what you have to do is catch a slowpoke, then find a king's rock and make your slowpoke hold it. get another copy of emerald, or ruby and Sapphire will work fine, and then trade your slowpoke, and watch it evolve into the magnificent slowking. ENJOY YOUR NEW POKEMON
You can't catch it in Black, but you can catch it in White. In the White Forest.
not catch but by Pokemon transfer or the Dreamworld
You can not catch any of them in black or white, but I think that you can catch all 3 in diamond.