My Little Pony Equestria Girls: Rollercoaster of Friendship (2018) on Netflix

Plot summary

Rarity spends the summer working as a costume designer at Equestria Land, a new amusement park, where Vignette Valencia is the park's chief costume designer and its public relations manager. Vignette hires Rarity to create costumes for a special parade and decides that the Rainbooms should take part in it. Rarity has invited Applejack, Rainbow Dash, Pinkie Pie, Fluttershy, Sunset Shimmer and Twilight Sparkle to the park for the day. When Vignette proposes new looks for Fluttershy and Rainbow Dash, the two refuse, and her phone, enchanted with stray Equestrian magic, pulls them inside. Applejack cannot find either of them and looks for Rarity.