These are the pokemon you can have during mono runs afaik (excluded box legends, Tapus, Ultra Beasts, and Type: Null:, Silvally, and Porygon since you can't get them til postgame)

>Normal
Alolan Raticate, Fearow, Wigglytuff, Snorlax, Tauros, Kangaskhan, Eevee, Blissey, Smeargle, Miltank, Spinda, Castform, Slaking, Staraptor, Stoutland, Braviary, Toucannon, Gumshoos, Bewear, Oranguru, Komala, Drampa

>Fire
Arcanine, Alolan Marowak, Flareon, Typhlosion, Torkoal, Magmortar, Emboar, Chandelure, Talonflame, Icineroar, Baile Oricorio, Salazzle, Turtonator

>Water
Slowbro, Golduck, Gyarados, Tentacruel, Cloyster, Poliwrath, Seaking, Starmie, Vaporeon, Lapras, Feraligatr, Lanturn, Politoed, Azumarill, Slowking, Corsola, Kingdra, Pelipper, Whiscash, Luvdisc, Milotic, Relicanth, Walrein, Sharpedo, Wailord, Lumineon, Gastrodon, Samurott, Alomomola, Carracosta, Greninja (?), Primarina, Wishiwashi, Toxapex, Araquanid, Golisopod, Pyukumuku, Bruxish

>Electric
Alolan Raichu, Alolan Golem, Jolteon, Lanturn, Magnezone, Electivire, Luxray, Emolga, Eelektross, Vikavolt, Pom-Pom Oricorio, Togedemaru

>Grass
Parasect, Alolan Exeggutor, Victreebel, Meganium, Roserade, Leafeon, Serperior, Leavanny, Lilligant, Whimsicott, Trevenant, Decidueye, Lurantis, Shiinotic, Tsareena, Dhelmise

>Ice
Alolan Sandslash, Alolan Ninetales, Cloyster, Lapras, Delibird, Walrein, Glalie, Glaceon, Froslass, Weavile, Mamoswine, Vanilluxe, Crabominable

>Fighting
Primape, Machamp, Poliwrath, Hariyama, Lucario, Emboar, Conkeldurr, Pangoro, Crabominable, Bewear, Passimian, Kommo-o

>Poison
Victreebel, Gengar, Alolan Muk, Tentacruel, Ariados, Crobat, Roserade, Garbodor, Scolipede, Toxapex, Salazzle

>Ground
Alolan Dugtrio, Whiscash, Flygon, Garchomp, Gastrodon, Rhyperior, Mamoswine, Krookodile, Zygarde, Mudsdale, Palossand