Note
Horses are not suppose to turn into a skeleton horse when struck by lightning. Skeleton horses come from "skeleton traps" that spawns during a thunderstorm. The lightning that comes from the trap is visual and not real as it does no damage to mobs or set blocks on fire. If you want to spawn a "skeleton trap" with commands, summon a skeleton horse with the NBT data SkeletonTrap
set to 1
like this: /summon minecraft:skeleton_horse ~30 ~ ~ {SkeletonTrap:1
}
there is a bug in 1.14 release and pre-release as well
when a horse struck by lightning summoned through commands or channelling trident it dosent change to skeleton horse
i dont know about natural lighting strike but we cant get it via trident means we cant get seleton horse in survival only via commands ( /summon command or spawn egg )
meaning in 1.14 its IMPOSSIBLE specially in server to obtain the rare skeleton horse
please fix it .. its very important
and thanks
I think skeleton horse don't spawn that way. They spawn from skeleton traps. Read more about it here: skeleton horse