I'll update later with all the pairings but have fun guessing for now!  Fun fact I've been drawing these guys since December but never actually posted anything about them. There's about 5 more I haven't drawn on her as well

EDIT - added the names and stuff:

1st row (left to right):

Crystal Shield(CadancexShining), Firecracker (spikexscootaloo), Party Canon(Pinkiexdash), Rainbow Pie(Pinkiexdash)

2nd row (left to right)
Scholar (TwilightxSunset shimmer), Peppermint (lyraxbonbon), Binaural Beat(VinylxOctavia), Sequin Stitch(RarityxAJ), Dawn Song(TwilightxSunset shimmer)

3rd row (left to right)
Dazzling Gleam(RarityxAJ), Time Lapse(derpyxdrhooves),  Featherfall (FluttershyxThunderlane),Allure(CelestiaxDiscord)

Not pictured - 
 Glimmering Ribbon (Rarity x AJ)
Level Up (Sweetie Belle x Button Mash)
 Chiptune (Sweetie Belle x Button Mash)