Alpha Kretin

The Alpha Kretin is a very powerful boss in Mario & Luigi: Bowser's Inside Story. The Kretin is first encountered when all six of its beta parts are kidnapping Peach in Bowser's Flab Zone. Once Mario and Luigi encounter it, they do their famous double tornado, sending the betas flying from Peach. A small celebration is held, but it is cut short when the betas appear once again, but this time, they form into a powerful creature called the Alpha Kretin. The Alpha Kretin looks very similar to its beta parts, except that its betas changes its colors to red and green. It also grows one giant set of arms and legs. Only Mario can hit the red parts while only Luigi can hit the green parts. Once all of the pieces have turned blue, five of the pieces die and only one survives. The one that survives is the the one that controlls the Kretin, and it creates its five beta Kretins again. The best way to defeat the Kretin in this form is to have Mario first use the Fire Flower to obliterate all of the fake Beta Kretins and then use the Jump Hat with Luigi to do severe damage. Repeat this process until the Kretin is destroyed.

Alpha Kretin-X
Once the Alpha Kretin has been destroyed, Class 2 is automatically unlocked in the Challenge Node located deep inside Bowser. In order to participate in Class 2 and fight Alpha Kretin-X, you must pay a toll of 400 coins. Once the toll has been payed, the Kretin reappears in its more powerful form, in which the Beta Kretins assume a different appearance, making them look more fierce and solid. Mario and Luigi should be at least level 22 to ensure a powerful win.