Rainbow Dash X Gizmo
I know Rainbow Dash may not like eggheads like Gizmo but I’m sure he’ll be impressed with her moves (I.E. Sonic Rainboom), being playful, and reading Daring Do books.
Pinkie Pie X Discord
They both love to break fourth walls and go nonsensical.
Rarity X Thunderlane
It seems like Rarity is the most loved pony as she would be impressed by every of his move. Plus, a tough guy like Thunderlane is just exactly what Rarity needs.
Twilight Sparkle X Flash Sentry
I think everybody agrees with me on this one. I just cannot imagine Twilight being with anypony else besides Flash Sentry.
Fluttershy X Open Skies
(Captain Obvious Alert) They are both Pegasi ponies and I think both of them may counsel and connect with each other when the tough times roll.
Applejack X Donut Joe
They are both into food industry and with them together they can come up with even more ideas.
Are you gonna spam that comment in every Flashlight related picture you see?
Crack Pairings often don’t make sense.