You can't without hacking.
You cannot catch Genesect on Pokemon Black or White. You will need to go to a Pokemon Event. No Genesect events are announced yet.
genesect can't evolve
Genesect is a legendary Pokémon which means no NPC trainers will be holding one.
In order to get Genesect in Pokémon Black 2 and White 2, trading is required.
Wait for a wifi event
you use action replay dsi to catch genesect(genesekuto)
you cant you have to wait for the special distribution
You get Genesect throught event.
i dont know my friend
An event
no you can only get it by event
the date is unknown and yet to be classified