Mecha Bowser apears in Super Mario Sunshine and Mario Galaxy, and Mecha Bowser is a giant and robotic version of Bowser.
His weakness is water in Super Mario Sunshine. In Mario Galaxy, he is gigantic and huge. The player need to run and drill the arms, legs, chest and head for its defeat and a star.
Super Mario SunshineMecha Bowser first appears in Super Mario Sunshine where it is controlled by Shadow Mario a.k.a. Bowser Jr. Mecha Bowser can be found inside of Pinna Park. Mario must use a rollercoaster with F.L.U.D.D. and fire water at Mecha Bowser when close by. Mario must be on the look for Bullet Bills attempting to attack Mario himself. Mecha Bowser also spits fire on the rollercoaster tracks. To defeat Mecha Bowser, Mario must find water-powered rockets and fire them with F.L.U.D.D. at it. The mechanical menace was defeated and shut down.
Mario Tennis series
Mario Power Tennis
Mecha Bowser reappears in Mario Power Tennis. In this game, Mecha Bowser occasionally appears on the stage to tilt the course. It is also a boss in a minigame.
Mario Party series
Mario Party 5
Mecha Bowser appears in Mario Party 5 in the Toy Dream party board where it shoots players out of cannons when landing on his space back to the starting point.
Mario Party 7
Mecha Bowser makes a cameo appearance in Mario Party 7 where his can be seen in Bowser's Enchanted Inferno.
Super Mario GalaxyMecha Bowser reappears in Super Mario Galaxy as a toy robot this time. However, Mecha Bowser still is green, but has the blue coloration replacing the yellow. Mario can defeat the Mecha Bowser by ground pounding through the rocks on its head and free the Gearmos inside of it.
- Mecha Bowser is comparable to Bowser, False Bowsers, and King Boo's fake Bowser in that these are all other enemies in disguise trying to use the abilities of Bowser.