that is mission impossible. no non starters can teach blast burn:(
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I know how to teach it Blast Burn in Pokemon Platinum only, so if you are using Diamond or Pearl version, this might not work. Anyway, there is a house on Route 228. Go inside the house and the person inside will teach Hydro Cannon, Frenzy Plant, or Blast Burn to your starter Pokemon.
Sorry. Blaziken is the only Fire type starter that does not learn Blast Burn
teach your starter Pokemon its ultimate move but needs to be a high level. venasaur=frenzy plant charizard=blast burn blastoise=hydro canon
you go to dration in the last city
Any Pokemon that is grass, but it must be with you.