My Little Pony: Friendship is Magic Colt Version is a male version of My Little Pony: Friendship is Magic. Fans usually change the pitch or dub scenes from the show in a more male voice. There are many videos of such.
It was started by a deviantart user by the name of Trotsworth, who often vectored ponies and decided to do a bit of genderbending. Not only has he genderbent the mane cast, but he has also genderbent Spike and Celestia.
The cast also look different and have different names.
Twilight Sparkle = Dusk Shine
Fluttershy = Butterscotch
Rarity = Elusive
Applejack = Applejack
Rainbow Dash = Rainbow Blitz
Pinkie Pie = Bubble Berry
Spike = Barbara
Celestia = Lord Solaris
Big Macintosh = Macareina
Luna = Prince Artemis
Discord = Eris
Queen Chrysalis = King Metamorphosis
Princess Cadence = Prince Crescendo
Shining Armour = Gleaming Shield