Well that depends. There are multiple codes one for every Dark Wolf. If you want the code i suggest you buy a Dark Wolf and use the code. So pretty much no one can answer this except for what i said about the multiple codes
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You just battle and win a lot then later you will I recommend battle coliseum because i did that and i am rank s+
unlock b-killer on beyblade metal fusion and connect the wii game (beyblade) to the ds and use the ds to connect to the wii to exchange parts
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get the cyber pegasus edition
gamefaqs.com or just search it in google