Some of my Ideas:
Typhlosion: Level up in Goldenleaf/Wispy Ruins/Level up while fainted
Samurott: Level up in (dark)Phasial Cave
Decidueye: As mentioned Sheridan or Akuwa Town/ Ice Cave/ near Akuwa because of its Pokedex entry/Evergreen Forest
Zoroa: Best place to get according to dexentey would be neverwinter but thats not available yet so maybe as a gift from Kreiss after Angie fight/ Ice cave near Akuwa Town/Angies Rift so its kinda close to when you can obtain normal Zoroark
Liligant: Level up/Sun Stone in Valor Mountain or with Rock Climb
Victory Dance as an physical version of Quiver Dance/ fighting type Dragon Dance?
Kleavor: Add evolution item as mineable/ Level up in any Cave
Voltorb: Pokeball Factory(kinda late), Kristiline Museum as an event encounter ("and as next part of our Tour we have an ancient pokeball!")
Braviary: Don't have normal version yet but Rufflet can lern Zen-Headbutt with Move Tutor so level up with that
Wyrdeer: Stamtler learns Zen Headbutt at Lv 38 so level up with that?
Qwilfish: Fishing in Sewers with good rod
Growlith: Overworld Encounter ala Vulpix in Valor Mountain (magma version)/ Buy with Shards in Caratos Mountain.
Sneasel: Evergreen Forest (Rock climb needed), Valor Mountain overworld encounter (ice version)
Sneasler: Level up with Razor Claw during day
Ursaluna: add evolution item as mineable item and then level up while holding at night/use it at night
Basculegion: Make Basculin Faint with use of Recoil Move/ Defeat wild Basculin with recoil move/ dusk stone
Sliggo: Level up Goomi with Metal Coat equiped/ Use Metal Coat on it/ Special item as gift after finishing goomlink quest line