You could slash Hidden Power Electric as an option that can still combat Jellicent, but also maims Gyarados and Tentacruel, two Pokémon that resist other moves that Keldeo may use. Hidden Power Bug could also be suggested to surprise Celebi; on sandstorm, it KOes after Celebi switched on Stealth Rock and a Hydro Pump. It still covers Lati@s but fails to cover Jellicent, however.
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