Answer 1

Legally:
There was an Event in Japan that let people get Speed Boost Torchics in the Dream World in Japan. They could have been traded via GTS negotiations.

Illegally:
Pokesav, PokeGTS, Action Replay, or PokeGen.

Comments

Uh Mew you just said exactly what I said but confirmed the event thing.

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I was answering slowly, I was battling and answering at the same time. So, I didn't see your answer.

Answer 2

Pokegen or Pokesav so in other words they hack

Comments

That is not his question.

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oh my bad

Answer 3

They probably used AR to hack the game or Pokegen/Pokegts. Also if I recall correctly there was a special event in Japan when B/W was first released, but I could be wrong about that.

Comments

Do you guys know if there will be an event for speed boost blaziken anytime soon?

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theres no information on it yet but its possible