Spike ID S4E24

Spike is a purple and green baby dragon who met Pooh and his friends in Pooh's Adventures of Thomas and the Magic Railroad after Twilight Sparkle rescued them from The Grand Duke of Owls. He is Twilight Sparkle's friend and assistant. His ability to magically deliver scrolls to and from Princess Celestia with his green fire-breath is featured in many episodes, as is his crush on Rarity.