Space the Cloud Cat was strolling through a field when he felt a goo ball hit him in the back of his head. He saw a glimpse of a certain grey bird flying away laughing as it covered him and began to change him. He felt himself fall on all fours and become more like a motorcycle, and it felt good. Stepping out of the goo, he turned to look at his new tail, blushing from the new sensations. He got the feeling this would wear off after a while, so he was eager to play around with it

Master Ball Reference - Post TF :  Space