All about the ancient tribes
Skeleton horses spawn only from “skeleton traps”. A “skeleton trap” horse is a skeleton horse spawned from a fraction of lightning strikes during a thunderstorm or by chance (0.75–1.5% chance on Easy, 1.5–4% on Normal, and 2.25–6.75% on Hard, depending on regional difficulty).
You can turn Creepers into Charged Creepers, Pigs into Zombie Pigmen and Villagers into Witches. But Horses don’t turn into Skeleton Horses. A lightning strike has a chance of creating a Trap Horse which looks like an ordinary horse but if you get close to it it turns into 4 skeletons on skeleton horses.
A skeleton horse can be tamed by killing the skeleton that is riding the horse. Then, the player will be able to tame it. A saddle is required, too.
Dragon Egg
The rarest regular spawning horse is easily the skeleton horse…
How to Enter the Command
A skeleton horse that spawned from a skeleton horse spawn egg cannot be ridden on, open its inventory, put a saddle on it, be tamed, feed it. An undead horse that spawned from an undead horse spawn egg cannot be ridden on, open its inventory, put a saddle on it, be tamed, feed it.
Skeleton horses should behave like skeletons (Burn in the sun & despawn quicker in the day) … The only way to find/ capture a skeleton horse is if a living one gets struck by lightning.
You can add the Channeling enchantment to any trident using an enchanting table, anvil, or game command. Then throw the enchanted trident at a mob in the rain, and watch a lightning bolt strike the mob just after the trident hits it. The maximum level for the Channeling enchantment is Level 1.
When a new skeleton trap horse group spawns, a strike of lightning will occur. … If triggered on water, the skeletons and horses will sink into the water, causing the skeletons to eventually take drown damage if they don’t have a helmet with Respiration.
Thoroughbreds