It will turn into Zekrom when you team plasma N's castle and talk to N.
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Beat the Elite Four and then you talk to N and Zekrom comes out of the Dark Stone. You have to catch it to battle N, so bring lots of Ultra Balls! After you catch it, you have to fight N and Ghetsis.
First of all you have to find N in N's Castle, a Zoroark will guide you there. You will battle N. When you beat him Zekrom will turn into the Dark Stone and you have to take it to Dragonspiral Tower. Catch Zekrom and then go to Giant Chasm. Kyurem will be there.
To get the dark stone you need to go to the relic castle to find that it is not there and the you receive a call from professor juniper to go to the museum in nacrene city and you will receive it from the gym leader
dark stone? are you crazy? what is a dark stone? there is no such thing. btw if you meant firered write that instead of red
The Japanese translation for dark stone in the American versions of the game was dusk stone. The dusk stone cannot be found in games prior to Pokemon Diamond, Pearl, and Platinum.