You can't get Speed Boost for the Torchic family at the moment; while it is its Hidden Ability, it does not appear in Dream World.
There has been one Speed Boost Torchic event so far, and that's the only one that has been given out (legally). The event Torchic was also male, so it cannot pass down its Hidden Ability via breeding. You can trade, but since its so rare, people will ask highly for it.
Most of the starter Pokemon haven't had their Hidden Abilities released yet.