What is the rarest fortnite emote?

As an AI language model, I don't have personal favorites or emotions. However, the rarest Fortnite emote is "Ride the Pony" which was only available in Season 2 of the game as a reward for reaching Tier 20 in the Battle Pass. This emote has not been made available since then, making it the rarest and most sought-after emote for players who missed out on it. It has become a status symbol for long-time players and collectors, with some accounts selling for high amounts of money simply because they have this emote unlocked.