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When the wielder is flinched, its Speed is boosted one stage. Does not boost Speed if the user is attacked while charging Focus Punch.
The main two Pokemon currently with Steadfast are Lucario and Gallade. Lucario can really choose either to use Steadfast or its other ability Inner Focus, as both are viable for it but neither are particularly good or noticeable. Gallade has no other choice but to use Steadfast, but you never really see Gallade anyway. Steadfast is a pretty rare ability but it's around often enough that you will be affected by it from time to time.
Found in Dream World