Genesect cannot be obtained without using an Action Replay or participating an event during normal gameplay. However, you can get Genesect by simply trading for it with someone who owns one.
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You cannot find Genesect in Pokémon Black because it's an event-only Pokémon so it can only be gotten either via a special character distribution or via a cheating device such as a Action Replay.
u cant u can get it only in a special event and a action replay sorry
Using an action replay.
No, unless you want to use the Action Replay for the Event.
You can't. Use Action Replay.