It depends on your country — and a whole group of countries skips legalisation entirely.
The power of attorney follows the legalisation route of the country where it is signed. Members of the Hague Apostille Convention notarise and apostille; parties to the Minsk and Kishinev conventions — most CIS states — need only a notarised original, in Russian, with no apostille and no consular step; all other countries legalise through an Uzbek consulate. Translation into Russian or Uzbek completes the document where it is not already in one.
What the registration act itself requires is narrower than the legalisation question: where a representative files in person, they produce a document identifying themselves and a document confirming their powers, executed in the manner established by law — and it names the power of attorney first. How a foreign power of attorney acquires that standing is settled by the legalisation instruments rather than by the registration procedure, which is why the route depends on the country and not on the registry. (Registration Regulation, Para. 31 — lex.uz ↗)
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