McKalie - Daisy (not sure on costume)
Clefaery - Pixie Lati
Clefarious - Villain Yuni
Shaqiri - Christmas Tree or Arcade Rofling
Oddish - Bug Limax
Audino - Coral Phanty
Rotom - Robot Mordo
Mordosaur - Arcade Mordo
Hanson - Tornado Ike
Deeper - Teal Phanty - Safari?
Lullabelle - Doll Kujo
Speechless - Cartoon Justin
Eleska - Eleka Lati
Hayato - Bug Oglue
ErikMichael**
Skydive - Baby Nino
Lade - Sports Crikey / Spring or Sleepy Viotto
Ouimette - Baby Quell
Robles - Gobble? (Prison or Halloween)
GSU - Gothic Troit
Conversion - Sports Quell
Perky - Zombie Equilor
Capitvate - Hairy Straya
Lounge - Fat Limax
Incubate - Baby Osafo
Rams - Chibi Daisy
Kimbap**
Reckon - School (not sure on species)
Taikong - Spacefairy Gonk
Bartizan - Skater Snookle
Seedric - Chibi Kujo
Pryce - baby fasoro?
Conkers - Scout Ercuw
Rekua - baby??
Exomi - Daisy??
Floa - baby??
Marabone - Valentine Oglue
Nidoprincess - Doll Kalaa
Vilegloom - Earth Fairy Vixen
Rowlithe - Anime Raulf
Teoki - Rainy Gobble
Tiogair - Calico Figaro
Etoranze - Pampered Huthiq
Dracha - Dragon Gizmo
Behrami - Sleepy Quell
Drmic - Advent Ushunda
Inler - Vampire Tantua
Xhaka - Chibs (not sure on costume)
saklo - Genie Sindi
Imojinn - Jinn Sindi
Seferovic - Bootleg Kujo
Yoshikatsu - Arcade Zetlian
Aguardiente - Frostfire Viotto
Raguel - Angel Hump
Ronove - Zombie or Gothic Oglue
Gears - Steampunk Phanty
Cousin - Hairy Echlin or Mafia pet
Tadpolio - Baby Renat
Seviper - Poera (possibly cartoon or snowman)

** Not sure yet - open to suggestions