My Little Pony: Friendship Is Magic (2010)

S1E6 Boast Busters

A flashy unicorn named "The Great and Powerful" Trixie rolls into Ponyville, boasting that she possesses unmatched magical abilities in all of Equestria. Spike thinks Twilight is the perfect pony to challenge Trixie's arrogance, but Twilight hesitates, fearing that revealing her own extraordinary skills might lead to her friends losing faith in her.