This is Fluttershies cutie mark it lets her be and talk to animals she has this cutie mark because the butterflies saved her and they were the one how gave her cutie mark.
This is Rainbow dash's cutie mark it lets her fly very very fast she has this cutie mark because she is the one how made the ponies friends.
This is Twilght Sparkles cutie mark she has because she would had never be the princess of friendship.
This is Apple jacks cutie mark she has it because she would not be bucking apples and there would be no apple cider no apple pie no apples.
this is Pinkie pies cutie mark she has it because she would never do any parties at all or even make cupcakes or cakes.
This is Rarities cutie mark she has it because then no pony would wear anything fancy or anything.