Pokemon Regalia Evolution Guide

Regalia Evolutions:
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N/A - Not Available Yet

Scyther:
Scizor (Dusk Stone)

Ralts:
Kirlia (Level 30)
Gallade (Level 48 Male)
Gardevoir (Level 48 Female)

Pichu:
Pikachu (Happiness)
Raichu (Leaf Stone)

Fletchling:
Fletchinder (Level 26)
Talonflame (Level 48)

Sneasel:
Weavile (Grass Gem at Night)

Tentacool:
Tentacruel (Level 45)

Growlithe:
Arcanine (Dragon Stone)

Cubone:
Marowak (Level 55)

[N/A] Charmander:
Charmeleon (Level 30)
Charizard (Level 50)

Phantump:
Trevenant (Level 52)

Magikarp:
Gyarados (Level 50)

Drilbur:
Excadrill (Level 50)

Modified Evolutions:
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Alolan Raichu (Dawn Stone)

Alolan Marowak (Dusk Stone)

Leafeon (Leaf Stone)

Glaceon (Ice Stone)

Sylveon (Happiness While Knowing a Fairy Move)

All Trade Pokemon use a Net Stone.
If the Pokemon holds an item while being traded, instead level it up while holding the item.
For example, level up Scyther while holding a Metal Coat or Seadra while holding a Dragon Scale.

Hope this helps!