6 books in series

My Little Pony: Friendship is Magic

My Little Pony: Friendship is Magic is a 6-book series with 6 released primary works first released in 2013 with contributions by G.M. Berrow.

My Little Pony: Twilight Sparkle and the Crystal Heart Spell
My Little Pony: Pinkie Pie and the Rockin' Ponypalooza Party!
My Little Pony: Rarity and the Curious Case of Charity
My Little Pony: Applejack and the Honest-to-Goodness Switcheroo
My Little Pony: Fluttershy and the Fine Furry Friends Fair
My Little Pony: Lyra and Bon Bon and the Mares from S.M.I.L.E.