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.
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you use action replay dsi to catch genesect(genesekuto)
You'll need to wait for a Mystery Gift event for the future to get Genesect. In Japan they still haven't got Genesect. So, it maybe awhile.
I have a feeling it is the boat u ride to the p2 lab for the genesect event.
You can not get him while playing a game. I believe there will be a wifi event in which he will be given.
Genesect is not capable of evolving.