Big Love Rocket

The Big Love Rocket is a mount available only as a very rare drop during the Love is in the Air event.

Source
This item is rarely contained in the Heart-Shaped Box, awarded for level 50-60 adventurers' first defeat of Apothecary Hummel each day. It has an extremely low drop rate; <1% according to the Armory.

Mount Journal
Apothecary Hummel painted this masterpiece bright pink for an unrequited love.