Fracktail

From Paper Mario Wiki

[edit] Fracktail

In Super Paper Mario, he is the boss guarding the Second Pure Heart. He is a kind and friendly robotic dragon who upon meeting will rise out of the ground in the Yold Desert. He talks like a computer, and uses various computer terms, (example: CTRL ALT DEL) and makes references to old Zelda games (example: I AM ERROR.)

Until Dimentio turns him against you using magic, he is quite nice. As a boss, his weakness is his antenna, which you reach by jumping on his back and throwing enemies at it.