Previous PU mons that were removed consist of: Dodrio, Gigalith, Pelipper.  Drought and Drizzle have also been banned. You can still use sun and rain with manual setters.
SM
Crabonminable
Dugtrio-Alola
Exeggutor-Alola
Golem-Alola
Passimian
Gumshoos
Komala
Lurantis
Mudsdale
Oranguru
Oricorio
Oricoro-Pa'u
Oricorio-Pom-Pom
Oricorio-Sensu
Palossand
Raichu-Alola
Raticate-Alola
Sandslash-Alola
Shiinotic
Silvally (all forms)
Togedemaru
Toucannon

Previously BL/NU/RU mons
Aggron
Claydol
Cradily
Ferroseed
Kecleon
Miltank
Sandslash
Piloswine
Hariyama
Machoke
Carracosta
Granbull
Victreebel
Vigoroth
Barbaracle
Ambipom
Togetic
Primeape
Regirock
Haunter
Pinsir
Poliwrath
Torterra

Previous PU mons
Altaria, Ampharos, Arbok, Ariados, Armaldo, Articuno, Audino, Avalugg, Banette, Basculin, Bastiodon, Beartic, Beautifly, Beedrill, Beheeyem, Bellossom, Bibarel, Bouffalant, Butterfree, Cacturne, Camerupt, Carbink, Carnivine, Castform, Chatot, Cherrim, Chimecho, Clefairy, Combusken, Corsola, Crustle, Cryogonal, Dedenne, Delcatty, Delibird, Dewgong, Ditto, Drifblim, Dunsparce, Dusknoir, Dustox, Electrode, Emolga, Farfetch'd, Fearow, Flareon, Floatzel, Furfrou, Furret, Gabite, Girafarig, Glaceon, Glalie, Gogoat, Golduck, Golem, Gorebyss, Gothitelle, Gourgeist, Grumpig, Heatmor, Huntail, Hypno, Illumise, Jumpluff, Kadabra, Kingler, Kricketune, Lapras, Leafeon, Leavanny, Ledian, Lickilicky, Lopunny, Lumineon, Lunatone, Luvdisc, Luxray, Magcargo, Maractus, Marowak, Masquerain, Mawile, Meganium, Meowstic, Metang, Mightyena, Minun, Misdreavus, Monferno, Mothim, Mr. Mime, Muk, Ninetales (no drought), Ninjask, Noctowl, Octillery, Pachirisu, Parasect, Pawniard, Persian, Phione, Pidgeot, Plusle, Politoed (no drizzle), Prinplup, Probopass, Purugly, Quagsire, Raichu, Rampardos, Rapidash, Raticate, Regice, Regigigas, Relicanth, Roselia, Rotom-Fan, Rotom-Frost, Sawsbuck, Seaking, Seviper, Shedinja, Simipour, Simisage, Simisear, Slaking, Smeargle, Solrock, Spinda, Stantler, Stoutland, Stunfisk, Sudowoodo, Sunflora, Swalot, Swanna, Swoobat, Tangela, Torkoal (no drought), Trevenant, Tropius, Unfezant, Unown, Ursaring, Vanilluxe, Vespiquen, Volbeat, Vullaby, Wailord, Walrein, Watchog, Whiscash, Wigglytuff, Wobbuffet, Wormadam, Zebstrika