Leaving the initial list in in case I trimmed too quickly.... Part of an evo line + single typed:
+ It's name starts with R, S, T, U, V, W, X, Y, or Z:
Bug
Wurmple/Silcoon
Shelmet
Scatterbug/Spewpa
Tarountula/Spideops
Rellor
Dark
Umbreon
Zorua/Zoroark
Thievul
Dragon:
Shelgon
Electric:
Raichu
Voltorb (KAnto)
Shinx
Zebstrika
Tynamo
Yamper
Tadbulb
Fairy:
Togepi
Snubbull
Spritzee
Swirlix/Slurpuff
Sylveon
Fighting:
Tyrogue
Riolu
Sirfetch'd
Fire:
Vulpix (Kanto)
Typhlosion (Johto)
Slugma
Torchic
Tepig
Simisear
Torracat
Scorbunny/Raboot
Flying:
Rookidee
Ghost:
Shuppet
Yamask (Unovan)
Sinistea
Grass:
Tangela
Sunkern/Sunflora
Treecko/Sceptile
Seedot
Shroomish
Turtwig
Tangrowth
Snivy/Servine/Serperior
Simisage
Skiddo
Steenee/Tsareena
Thwackey/Rillaboom
Sprigatito
Ground:
Sandshrew/Sandslash (Kanto)
Trapinch
Silicobra /Sandaconda
Ice:
Vulpix (Alolan)
Snorunt
Vanillite/Vanillish/Vanilluxe
Normal:
Rattata/Raticate (Kanto)
Snorlax
Sentret
Teddiursa/Ursaring
Stantler
Zigzagoon (Hoenn)
Slakoth/Vigoroth/Slaking
Whismur
Skitty
Watchog
Stoutland
Yungoos
Type:Null/Silvally
Skwovet
Wooloo
Tandemaus
Poison:
Weezing
Swalot
Trubbish
Psychic:
Slowpoke (Galar)
Wobbuffet
Spoink
Wynaut
Solosis/Reuniclus
Rock:
Sudowoodo
Rampardos
Roggenrola
Rockruff
Rolycoly
Water:
Squirtle/Wartortle
Seel
Shellder
Seadra
Seaking
Staryu
Vaporeon
Totodile
Remoraid
Wailmer/Wailord
Shellos
Samurott
Simipour
Tympole
Sobble
Wiglett/Wugtrio