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Grobot X is a boss in the game Mario & Luigi: Dream Team. It is the X boss version of Grobot that can only be faced in the Battle Ring. Grobot X is the only X boss required to fight in the main story in order to get the Zee Feathers for the Ultibed.
Grobot X's attacks are identical to Grobot's. It will fire balls of water that can either be small or large, the small ones bounce at Mario and Luigi's feet which they'll have to jump over and the large ones bounce over them. It can also turn around and charge at one of the Bros. which requires them to counter with their hammer. Additionally, it may chase the Bros. into the foreground of the battlefield while firing water spheres at them to try and cause them to trip.