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Also, I've read you can have Pokémons from Ruby/Sapphire and Diamond/Pearl in HeartGold/SoulSilver after you obtain National Pokédex or something. Read it's possible to have like near 500 Pokémons (though I'm unsure if you can obtain them all with only HG/SS).So, is it actually possible to obtain all Pokémons with Black/White too?
Well, I think that HG/SS have the same thing as D/P/P - the Pal park. You insert a game into the GBA socket and pick 6 of them. Then you enter the park and capture those 6. Wait a day then repeat.
Actually, I've read you can capture Gen. 3-4 Pokés by using a certain channel on your radio on certain days, but you need the National Pokédex. For example, you can apparently capture Absol in the Slowpoke Well if you switch to DJ something's channel on Wednesday.