Dionne

Dionne is a brown-coated, brown-eyed and brown-maned earth pony and the best friend of Cher.

Toys
Dionne is, as far as we know, a one-of-a-kind exclusive produced by Hasbro to celebrate Friendship Day and is not actually purchasable. She is based off Dionne from the film  and was paired by her best friend, Cher.
 * Friendship Day set
 * Year: 2015