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Bowser X is a boss that first appears in Mario & Luigi: Bowser's Inside Story and its 3DS remake. This upgraded form of Bowser only appears in the Challenge Node in Bowser's body and the Battle Ring. To get to him, the player must beat all X bosses without dying, and then face all the other X bosses in a row before facing Bowser X. He is the only X boss without a color change from the original and is one of two bosses to not be mentioned in the Prima Games guide, the other being the Shroobs.
Bowser X re-appears as an extra boss in the game Mario & Luigi: Dream Team. As with the previous title, Bowser X is a stronger version of Bowser who appears as an X boss in the Battle Ring in Pi'illo Castle. He is faced twice: once in normal form, and again in giant form. He is the second normal X boss faced, and the final giant boss in the Battle Ring.
Mario & Luigi: Bowser's Inside Story / Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey
Like all the other X Bosses in the Challenge Node, Bowser X has upgraded stats. He is capable of performing all of the original Bowser's attacks, as well as three new ones based on more abilities Bowser has learned through the game. However, Bowser X only uses two of his minion attacks (unless Bowser did not rescue Shy Guy Squad). When Bowser X's HP is low, he will use a Drumstick to regain all of his HP. The attacks Bowser X performs during battle include:
Mario & Luigi: Dream Team
During the first battle against Bowser X, he is accompanied by Antasma X in his bat form in Class 2 of the regular battle ring. Bowser X uses all the same tactics Bowser does for this battle: He can spew purple waves of fire at Mario before launching a bigger flame attack that Mario must jump over. He can also roll up into his shell and chase Mario through the foreground, creating flames that Mario must avoid while running; the red flames are avoidable by jumping, while the purple ones must be avoided completely. Bowser X will also attempt a sliding punch, which Mario must counter with his hammer; before punching, Bowser X may teleport behind Mario to catch him off guard. Unlike the regular battle where Antasma is forcibly popped out of Bowser and they retreat, Bowser X and Antasma X explode in defeat, possibly due to a lack of story in the Battle Ring, as it's part of the story that Bowser and Antasma escape.
Bowser X is also fought in Giant Class 5 as a giant boss. This fight is mostly the same as its story equivalent. However, his attacks are slightly stronger and faster, and his stats are increased. He also has slightly different attack patterns, and a turn limit of 6 is given.
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