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I only found out about Keldeo event last night, and was disappointed to find out that it was over, though I intend to get Genesect within the next week.
I work where you can download Keldeo, so I was able to get it after my shift. I don't really plan on using it though, and I still haven't picked it up from the Pokémon Centre.
I believe he has to learn Sacred Sword in B2W2 if you want him to change forme, if that's what you're after. If so, you'll need to make him forget the move and teach it to him again in Black2. If not, you have nothing to worry about c: