Electro Ball is only more powerful than Thunderbolt if you are at least 3x faster than the opposing pokemon. Tapu Koko has 394 speed, meaning that Electro Ball is only going to be better against targets with 131 speed or less. This would require the target to be uninvested base 47 or less. Most of the pokemon in this speed range are not OU relevant, and many who are are immune to electricity or are weak to fairy so you would never need to use this move against them anyways. Slowbro appears to be the only target that this has any relevancy against, turning a OHKO after rocks into a straight OHKO, and that isn't worth a moveslot.Is Electro Ball ever a viable choice over Thunderbolt? Not too familiar with the current meta, so I don't know if EB would net any valuable KOs that TB couldn't.
A scarf set might conceivably have a use for Electro Ball, since that will hit anything under 197 speed (uninvested base 80 or below) harder than thunderbolt. This notably includes Aegislash, as well as Mega Scizor and Heatran sets that don't run any speed. That's a very small list of potential targets, but given how metagame defining Aegislash is right now I guess running a move specifically to hit it as hard as possible could make sense. Still not worth the slot IMO since Aegislash is by no means a Tapu Koko switch-in. Plus Scarf Tapu Koko would be huge Dugtrio bait in the current meta.
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