In Pokémon Black and Pokémon White, you will need to take Keldeo, Cobalion, Terrakion and Virizion with you to the Moor of Icirus. Once you're there, a cutscene will happen that will involve the teaching of Secret Sword to Keldeo.
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You can get Keldeo from a special event. It's by using the Mystery Gift.
Keldeo cannot be caught in-game in Pokémon Black and Pokémon White because it's an event-only distribution Pokémon. Currently as of January 22, 2013, Keldeo cannot be received by event in Pokémon Black and Pokémon White; however, you can either opt to trade for one or you can opt to choose a cheating device in order to acquire one.
Keldeo is event-only pokemon. This means that Nintendo will distribute Keldeo for players to catch. The only other way is to cheat with Action replay, gameshark etc.
You go on liberty island. But first you need the liberty pass event ^that's for victini... -_- for keldeo you will need to keep your eyes out for an event that gives you a keldeo.
For the citizens of North America, the Keldeo event will be released at one point in the summer, this year of 2011. For only the versions of Pokémon Black and White.