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The wielder's Speed is boosted by one stage at the end of each turn. Speed Boost will not activate at the end of the turn that the wielder switches in.
This ability single-handedly sent Blaziken from solidly UU in DPP to Uber in BW. It is a great ability, and most of the Pokemon with it can make for solid cleaners. Sharpedo has brute force on its side, and can easily sweep a team with its brute force and coverage. Yanmega is strong and is an excellent user of the ability, although Tinted Lens as another great ability. You will see it occasionally, especially in UU.
It should be noted that Speed Boost is one of the factors that makes Ninjask stand out as a Baton Pass user, as all the Speed boosts accumulated while it is on the field can be passed on, thus making it easy to pass a couple of Speed boosts on if your opponent does not have a phazer or a Pokemon with Taunt; if they do, however, Ninjask tends to die very quickly.
Found in Dream World