Registeel's Not Here

Right, so I’m at the place where Registeel’s supposed to be.
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But it’s not here.

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I have both of the other Regis.
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And Registeel isn’t listed in the Pokedex, so I couldn’t have fought it by accident and forgot somehow.
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Does anyone have any advice? Or maybe the PBS files so I could debug this?

Maybe it’s only after a certain part of the story. You’ve beaten the rematch for the league, right?

No, but I don’t think that’d be much of a factor. I mean, it’s just Registeel. It’s not something as big as Landorus or Keldeo (both of whom can be caught without rematching the league).

Try finishing the Holon Region Quest if not already and then check the Registeel place again.