My Little Ferngully: The Last Rainforest

Twilight Sparkle is a breezie who lives in Breezie Village, a village in the Everfree Forest, and has never seen a pony before. In fact, she is told they are extinct. But when a logging company comes near the Everfree Forest, she sees that they do exist, and even accidentally shrinks one of them: a stallion named Flash Sentry. Now her size, Flash Sentry sees the damage that the company does and helps Twilight Sparkle to stop not only them, but an evil pony entity named King Sombra, who feeds off pollution.