What are all the three stage evolutions that don't require level up to evolve?

Question

Excluding Pokemon that evolve through happiness.

EDIT: I forgot to mention that the Pokemon have to be from stage one and evolve to stage three without leveling up at all. If there are no Pokemon like that, then you can answer with that. I'm sorry for any confusion caused.

Comments

But Eevee isn't a three stage evolution!

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Oops, my bad. Edited.

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I'm answering this, may take a while. editing my answer so much, so don't down-vote or  flag my answer yet, I'm editing please.

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You are editing so much, I have to edit MY answer so much ughh.
If you dare change it back, I'll hide my answer completely.

Answer 1

Just one(if I understand correctly. You mean like, you can get a final evo without leveling up at all from the unevolved Pokemon right)
The porygon line
Porygon->Porygon2 (Up-Grade)
Porygon2->Porygon-z(Dubious disc)

Sources:this,this, this, and experience,

Comments

Thank you.

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your welcome

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Yay the Porygon line. XD

Answer 2

Now that you've ruled out all except the first evolution, there is only one.

Pokemon that evolve while trading with an item:

Porygon (Pokémon)

Porygon evolves while trading with the Upgrade, and is the only first evolution to evolve while trading with an item.

Source, and remembering what I put in my answer to ~megaltaria~'s question

Hope I helped!

Comments

Blackquote isn't working...

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You have to put a space inbetween the quote and the words. Like this

> Amaura (Pokémon)
Budew (Pokémon)

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I edited a couple, don't know what's going on with the other two.

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I think there has to be a space between regular words and blockquote

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Thanks Kyogre, edited.

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Nvm, I think it's done now. I don't know if it's 100% percent good, probably will get down voted.

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Eevee and Applin are not three stage evolution lines. Sliggoo and Happiny evolve via level up. Budew evolves via friendship + level up. Charjabug and Magneton require levelling up outside of Sword and Shield. Piloswine and Steenee both need to level up after learning the necessary move.

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Thank you. My answer is turning really short lol, I think that's it.

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hehe fixed it take notes

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You still have Eevee in your answer.

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uhh, Oddish to Gloom includes leveling up!

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Oh yea, editing again...

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wut I added my porygon answer before youuuuuuu

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Yes, so? Sorry, I just remembered that Gloom wasn't first evo, and Absolover-*megaltaria told me.

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Thank you both.

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No problem! :)