Every time i did a he was still standing there with a message box saying Reshiram is gazing at "PLAYER"as if to say "try to catch me!" this happens if you faint it or run away.
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Reshiram is available in Pokemon Black. After you beat the Elite 4 for the first time, you will travel to N's Castle, to defeat him one last time. Before you fight him, you will encounter Reshiram. You MUST catch Reshiram to proceed. If you make Reshiram faint, you will just back up and have to battle him again. The only exception is, if your Pokemon team is full and every one of your PC boxes are full of Pokemon, making it impossible to store Reshiram, he will disappear when you defeat him. If that happens, you can find him later in the Dragonspiral Tower.
Reshiram. But if you make any other Pokemon stronger than it by level, yes, then it will be that Pokemon. But if you look to it by the side of legends and legendary power, it is Reshiram.
Well technically, you can't KILL a Pokemon. You can just make it faint. When you make a legendary Pokemon faint, it will be gone until you start a new game.
you can not catch ho-oh then if you saved after it happed
Yes you can fuse Pokémon however this is only possible in Pokémon Black 2 and Pokémon White 2. Using the DNA Splicers, you can fuse Kyurem and Zekrom to make Black Kyurem and Kyurem and Reshiram to make White Kyurem.