Two and one-half stars. Rated PG. 99 minutes. Lollipop-sweet and rainbow-bright, the four-legged gal pals of Ponyville go clippity-clopping from the small screen to the big in “My Little Pony: The Movie.” With its only slightly scary villain and a more cinematic style of animation, this perky adventure should give a thrill to the littlest fans of the TV show without actually scaring them.