Go to Blackthorn City and go inside the house right next to the Pokemart. Talk to the old man and he will teach your Blaziken Blast Burn, but only if it has full happiness.
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Sorry. Blaziken is the only Fire type starter that does not learn Blast Burn
go to lilycove department and buy the TM which includes something to do with fire (it is fire blast). then teach it to blaziken.
Headbutt is no a HM in Pokemon soulsilver. However a man in Ilex Forest will teach it to any Pokemon that can learn it.
that is mission impossible. no non starters can teach blast burn:(
Just teach it AncientPower, then level up