What happens if a Pokémon with libero/protean uses metronome?

Question

Do they become normal type or the type of the move that metronome chose?

Comments

Such Pokémon can't learn Metronome.

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Is kind of impossible as Pokemon with Metronome can't learn Libero or Protean and these two abilities are banned from Metronome battles.

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Hackmons?

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Isn't that in Showdown? But here this person's not mentioning the game!

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You could use Skill Swap in a doubles battle with the protean/libero mon.

Answer 1

It will switch to normal first, and then the selected move, if it isn’t normal.

Source: https://replay.pokemonshowdown.com/gen8purehackmons-1202453964