Why is Shedinja banned from NatDex Ubers?

Shedinja isn’t that great as: hail, sandstorm, curse, burn, poison, hazards etc, all stuff that is found fairly commonly in competitive, insta kill it, as well as like, at least five different types bypass its ability to also insta kill. But for reasons unknown to me it’s banned from Ubers. Why?

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Shedinja was banned simply because it was overpowered.This smogon discussionhas more information. But simply, with an air balloon (ground immunity) and Tera Electric, it could become almost invincible. It would have no weaknesses, so you could only kill it with status and weather. Shed tail, a move that gives a substitute to another Pokemon, could make Shedinja immune to everything except weather, Mold Breaker, Neutralizing Gas, Teravolt, and Turboblaze Pokemon. This lead to every team needing a Shedinja counter. Shedinja could also run various Tera types for walling specific Pokemon. In short, Shedinja could be almost invincible without dedicated counters, and these counters dying early would mean an auto win for the Shedinja team, and not knowing what Tera type it had would mean wasting precious momentum just to deal with it.