All I really need's a Smile Smile Smile

MOAR PONIES!
MOAR JERKY ANIMATION!
And quite ironically, LESS APPLES!

Also, to get the other joke out of the way; And that was the day Equstria was unmade...

Instead, we have Pinkie Pie and Berry Bubble, Ponyville's Pastry Baking Party Ponies! Huzzah! Dancing/Jumping/Something together. I personally like these two as best pony because together, they would be the most eternally happy ponies. Not that they aren't already, but If they meet I don't think even they could get sad over something (i.e. turn into Pinkamena Diane Pie 'n' Berriswainer DaVinci Bubble)

My Little Pony: Friendship is Magic:
Original Pinkie Vector:
This piece: