If you believe their support.
https://www.reddit.com/r/TheSilphRoad/comments/8lsqdi/confirmed_special_move_for_the_tyranitar_caught/
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I would take anything from POGO support with a heavy dose of salt, they are generally speaking clueless. They don't for example know about the catch and spin limits or the existence of softbans/speedcap.
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I think it's pretty clear that the caught Ttar after the raid will have Smack Down.
I think what the OP is asking is will the Raid boss automatically have Smack Down during the raid, or will the raid boss have the usual Iron Tail or Bite, or will it have a chance of any one of the three?
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I would say the boss would have any of the 3 possible moves