The Pumpkin was a limited pet from the Halloween Event (2020) that was removed on November 11, 2020. It was obtained after a player completed the Pumpkin Smash minigame for the first time. Players cannot get any more Pumpkins after they received their first one. It was automatically able to fly and ride, meaning that you didn't have to use a Fly-A-Pet Potion or a Ride-A-Pet Potion. The pet was also automatically full grown once you received it from the Pumpkin Smash.
This pet couldn't be traded, meaning, there was no legitimate means of obtaining a Neon or Mega Neon version of the Pumpkin.