What is the reason for the Terastal Clause?

Question

Self explanatory

Comments

I assume you mean in natdex formats.

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Yep (filler)

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Shedinja.

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No, Shedinja was just banned to Ubers when Terastal Clause didn't exist.

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And now it’s only banned in Ubers because there is no terastal clause in only Natdex Ubers and AG.

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Reason: old formats, unpredictability, and power creep control( looks at dracovish and shedninja).

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https://www.smogon.com/forums/threads/sv-national-dex-suspect-15-diamonds-terastallization-re-test-post-dlc2-new-suspect-process.3754393/