- HP: 10
- Attack: 3
- Defense: 1
Created by the X-Naut scientists, it is the toughest Yux in the game. It has a two-part battle plan:
- X-Yux can call upon two Mini-X-Yux enemies at a time. When it reach the maximum of four, the X-Yux uses an attack that deals 2 HP of damage per strike.
- It can immobilize Paper Mario and his Partner.
- Warning: If either character is immobilized, the best option would be to use the Run Away feature. An automatic Game Over will be assessed after a few rounds.
The best way to defeat an X-Yux, therefore, is to have Paper Mario and his Partner defeat the Mini-X-Yux enemies surrounding it first, and then focusing the attacks on it.
- The eyes of an X-Yux resemble those of a Blooper. This is true of the entire Yux family.
- Y-Yux and Mini-Y-Yux don't exist, since their pronunciation would have sounded like someone stuttering. (Instead, they are called Yux and Mini-Yux, respectively.)