i feel as though hidden power bug should be the first slash on the fourth moveset instead of hp electric, because hp bug has way more utility for keldeo. one of the most popular and most common walls to keldeo on any sand balance or sand stall team is specially defensive celebi, and with hp bug popping it for an easy 2hko, that's more critical than anything hp electric can do. hp bug also does a number on the lati twins, which is cool because it opens up holes for techniloom (one of ebelt keldeo's best partners) to sweep, whereas killing jellicent is a lot less important for loom's success. and speaking of jellicent, what else does hp electric even hit that's really necessary? all that's coming to mind is gyarados, and i haven't seen a gyarados in weeks. tentacruel is another thing, i suppose, but if your best answer to tentacruel is hp electric keldeo, you need to reevaluate your team.
i like the set overall. icy wind + hp bug combo to kill latios/latias is really nice. i want to hear some more input before i qc, though.