My Little Pony: Pony Life (2020)

S1E3 The Best of the Worst - Part 1

Rainbow Dash's fierce desire to win is challenged when a newcomer, Dishwater Slog, proposes an unusual competition. In a high-stakes race where only the worst competitor faces defeat, Rainbow Dash must confront her skills and reputation. This contest will determine once and for all who can claim the title of the worst pony.