Galarian formes

Smeargle - Fighting
Dotagou - Fighting/Evil

Its tail turns into a whip and it throws a watercolour palette as a boomerang.

Jynx - Water
Megeragela - Ground/Ghost

It is now a mermaid. When it evolves it choses to live on the ground and if it ever comes back it will be turned forever into foam.

Psyduck - Steel
Golduck - Steel
Armisouryu - Steel/Psychic

Their skin is made of pure gold. When the last evolution is reached, they will stop moving and will turn into a shimmering statue.

Gigantamax forms:

Megeragela

G-Max Moonlight Promise - Ghost - Heals 25% HP of allies and sets up Safeguard.

Jigglypuff

G-Max Mic Drop - Normal - 50% chance to put each target to sleep.

Volcarona

G-Max Sunspot - Fire - sets up Desolate Land while Volcarona is on the field.

Gyarados

G-Max Lake's Ragestorm - Water - sets up Primordial Sea while Gyarados is on the field.

Dusknoir

G-Max Reaper - always OHKOes a target of lower level.

Dustox

G-Max Makeover - boosts all allies' stats by 1.

Hypno

G-Max Hypnotise - lowers all foes' stats by 1.