First go to GameStop or look online for a device called an action replay for the DS or DSi download the software and in the program look or codes from codejunkies.us and then go to codejunkies.com Because black and white are new you'll most likely need to download some new firmware that is provided with simple step by step instructions so the codes will work good luck and happy gaming
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try swamperttools.webs.com its a pretty good place for all generations of Pokemon ROM hacking tools
Google is your friend, as well as "pokecommunity", they have a good tool box that has lots of ROM hacking tools for all the generations
http://crystalfallows.110mb.com/AutoIndex/index.php?dir=tools/RBY/ hope that helps also you can have a look around www.pokecommunity.com for great hacks and tools.
you carnt without cheating our hacking/codes
Yes. You find zekrom in Pokemon white and the white Pokemon in Pokemon black.