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You have to defeat the Elite Four and basically complete the main storyline of the game first. After defeating the elite four, this place called N's Castle will appear. You go through the castle, and you will have to fight N. Before that, Reshiram/Zekrom (depending on whether it's black or white version) will appear. You can choose not to catch it if you want to. If you catch it, one of your pokemon in your party will be put in the box (you can choose though) and Reshiram/Zekrom will take it's place. IF you DON'T catch Reshiram/Zekrom, you can find it again at Dragonspire Tower

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13y ago

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