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Bowser "Yoshi" is clearly Bowser’s pet Yoshi. It only appears in SM64 Bloopers: The Great Yoshi Race..
Bowser showed him to Mario and Yoshi and says his "Yoshi" is going to beat them. As Luigi hits a question block it’s summons Dr. Eggmans that blocked the path, then it jumps really high. It jumped on a speed boost and does tricks with Bowser, and get a 10/10 by the Old Man Hobo and SMG4. When Mario and yoshi got fire by anti-cheating canon they hit bowser and his yoshi.They bump into them, hurting it. Bowser was frustrated with this and they settle this with a fight. He then wreaks yoshi.