Kinto'un

The Kinto'un (筋斗雲, Kinto'un; lit. "Plot Box Cloud") is a magical, yellow cloud that serves as a way of transportation and is solely used by Son Gokū as a way for him to fly at high speed. Gokū obtained the Kinto'un many years ago when he just was a mere child wandering around the even most holiest and deadliest temples decades ago.

According to Gokū, this magical cloud can only be ridden by those with a pure heart which makes it very unstable and unusable to those with an evil heart of darkness.