The Keldeo should also have at least 30 speed and sp. atk IVs and be timid nature. I don't know what someone might want in exchange for it though. I have access to all 719 Pokemon and have a few shinies such as a 5IV Timid Treeko (-SpDef) and a 5IV Adamant Mudkip (-Def) (I would be willing to trade multiple for the Keldeo). I have a 6IV Ho-Oh (unfortunately without the coveted hidden ability). Sorry to be so unspecific. Let me know what you would want in exchange and I'll see what I can do.
Friend Safari: Ice: Bergmite, Snorunt, Cloyster