With the new Pokemon Scarlet and Pokemon Violet, new pokemon evolutions are available in the games! Now, some of them are from old pokemon and other are for new pokemon.
The evolutions listed in this guide, are those that are 'special' (meaning that is not only about leveling up, you need specific requirements in order to achieve the evolution).
The list of special pokemon evolutions are:
You need to trade 10 Bronzor or Polteageist fragments to get the evolution item "Auspicious Armor" in Zapapico. Then use this item in your Charcadet to evolve into Armarouge.
You need to trade 10 Sinistea chips to get the evolution item "Malicious Armor" in Zapapico. Then use this item in your Charcadet to evolve into Ceruledge.
You need to walk 1000 steps with Pawmo by your side. Once you have that, you level up your Pawmo and it will evolve into Pawmot.
In order to get Annihilape, you need to use Rage Fist 20 times with your Primeape. Then just level up and your Primeape will evolve into Annihilape.
To evolve your Girafarig, you need to level up while knowing the move 'Twin Beam'. Once you have that in your moveset, and +1 level, it will evolve into Farigiraf.
Your Dunsparce must know the move 'Hyper Drill'. Then, you need to level up and your Dunsparce will evolve into Dudunsparce.
The first requirement is to hold the object "Leader's Crest". Then you need to defeat 3 Bisharp that lead the horde of Pawniards while holding the item.
First, walk 1000 steps with Rellor by your side. Then, level up your Rellor 1 more level and it will evolve into Rabsca.
Walk 1000 steps with Bramblin by your side. Then, level up your Bramblin 1 more level and it will evolve into Brambleghast.
In order to get Armarouge, you need to
Tandemaus will randomly evolve into Maushold after level 25 off-screen. Check your Pokemon team and verify if it evolved.
You need to use a Fire Stone on your Capskid, then it will evolve into Scovillain.
Use a Thunder Stone on your Tadbulb. It will evolve into Bellibolt.
Cetoddle requires an Ice Stone to evolve into Cetitan.
Brave will evolve into Palafin when you reach level 38 in multiplayer mode.
In order to get Gholdengo, you need to collect 999 of Gimmighoul coins. Once you have that, you increase one level and your Gimmighoul will evolve into Gholdengo.