REX-2000

REX-2000, piloted by Mad Joey, is the sub-boss of the first Doppler Stage in Mega Man X3. It is a Ride Armor based on D-Rex.

REX-2000 attacks by firing shots and small homing missiles at X. The room it appears has a spiked ceiling that is slowly descending. If the player takes too long to destroy the sub-boss, the ceiling will eventually destroy it, first taking the pilot, making the machine stop, then REX-2000 itself.

If Zero is well, he will appear in the beginning of the battle and tries to stop the descending ceiling, stopping it after REX-2000 is destroyed. If Zero is out of action, a ceiling switch at the end of the room will impose a "time limit" for X, blocking his path and making the ceiling reach him unless it is destroyed. The switch's weak point is Triad Thunder.

Mad Joey
Mad Joey (マッド・ジョーイ) is the pilot from REX-2000. Mad Joeys appear alongside Guardroids as the normal Reploid enemies in Rockman X DiVE, wielding a variety of weapons. A red variant also exists, always wielding a Cannon rocket launcher weapon.

REX-2000(HANABI)
REX-2000(HANABI), known as MIKOSHI-710 in Japan, is a variation that appeared as the boss of the Mid-Summer Matsuri event stage "Fireworks and Lantern Festival" from Rockman X DiVE.

The Mad Joey pilot of this variant wears a "Tengu" mask and speaks in Kansai dialect. He claims that he is destined to perform the great firework for the Matsuri event. "Hanabi" (はなび / 花火) means "Fireworks" in Japanese, while "Mikoshi" is a sacred religious palanquin in Japanese culture.