Even though there a no new of them, Alolan Forms do make a return through this new adventure of The Alola Region. These given Pokemon - all of which originally found in the First Generation - have developed differently to how they usually have been outside of the Alola Region in order to better survive. This development sees these Pokemon taking on different appearances, having unique typing, stats and abilities as well.
When you transfer one of these given Pokemon from a previous game and breed them, you will get that Pokemon's Alola Form. However, if you attach an Everstone to said Non-Seventh Generation Pokemon and breed them, you will get their regular form found everywhere outside of Alola. Back in Pokemon Sun & Moon, you could not evolve into the regular Forms of Raichu, Exeggutor, and Marowak (obtained by transfer only); however, you now can by evolving Pikachu, Exeggcute and Cubone, respectively, while in Ultra Space.
Pokemon With Alolan Forms:
Rattata
Typing: Dark / Normal
Abilities: Gluttony / Hustle / Thick Fat
Base Stats: 30/56/35/25/35/72
Raticate
Typing: Dark / Normal
Abilities: Gluttony / Hustle / Thick Fat
Base Stats: 75/71/70/40/80/77
Raichu
Typing: Electric / Psychic
Abilities: Surge Surfer
Base Stats: 60/85/50/95/85/110
Sandshrew
Typing: Ice Steel
Abilities: Snow Cloak / Slush Rush
Base Stats: 50/75/90/10/35/40
Sandslash
Typing: Ice / Steel
Abilities: Snow Cloak / Slush Rush
Base Stats: 75/100/120/25/65/65
Vulpix
Typing: Ice
Abilities: Snow Cloak / Snow Warning
Base Stats: 38/41/40/50/65/65
Ninetales
Typing: Ice / Fairy
Abilities: Snow Cloak / Snow Warning
Base Stats: 73/67/75/81/100/109
Diglett
Typing: Ground / Steel
Abilities: Sand Veil / Tangling Hair / Sand Force
Base Stats: 10/55/30/35/45/90
Dugtrio
Typing: Ground / Steel
Abilities: Sand Veil / Tangling Hair / Sand Force
Base Stats: 35/100/60/50/70/110
Meowth
Typing: Dark
Abilities: Pickup / Technician / Rattled
Base Stats: 40/35/35/50/40/90
Persian
Typing: Dark
Abilities: Fur Coat / Technician / Rattled
Base Stats: 65/60/60/75/65/115
Geodude
Typing: Rock / Electric
Abilities: Magnet Pull / Sturdy / Galvanize
Base Stats: 40/80/100/30/30/20
Graveler
Typing: Rock / Electric
Abilities: Magnet Pull / Sturdy / Galvanize
Base Stats: 55/95/115/45/45/35
Golem
Typing: Rock / Electric
Abilities: Magnet Pull / Sturdy / Galvanize
Base Stats: 80/120/130/55/65/45
Grimer
Typing: Poison / Dark
Abilities: Poison Touch / Gluttony / Power of Alchemy
Base Stats: 80/80/50/40/50/25
Muk
Typing: Poison / Dark
Abilities: Poison Touch / Gluttony / Power of Alchemy
Base Stats: 105/105/75/65/100/50
Exeggutor
Typing: Grass / Dragon
Abilities: Frisk / Harvest
Base Stats: 95/105/85/125/75/45
Marowak
Typing: Fire / Ghost
Abilities: Cursed Body / Lightningrod / Rock Head
Base Stats: 60/80/110/50/80/45