When Return X was shot in his back by Enemice-HL, Return X decided to suspend his fight against X and Zero and temporarily fused with the two Maverick Hunters to improve their power, becoming the X Armor for them. When Zero was knocked out, the part of Return X that was on him moved to X, improving his armor and becoming the All X Armor.
After defeating Mix Forte, Enemice-HL used his Sigma Chip to turn into Sigma Limited, and he knocks down Zero. When Zero got unconscious, the part of Return X that was on him attached to X, becoming the All X Armor.
All X Armor
The All X Armor (アルイクスアーマー Aru Ikusu Āmā?, All "iX" Armor) is an armor made of Return X's body. X and Return X combined their busters into a powerful attack that defeated Sigma Limited, but the armor vanished because of the amount energy used, presumably destroying Return X. It is later revealed Return X survived.
|Mega Man X Series Armors and Power-ups|
|"First Armor" • "Second Armor" • "Third Armor" • Fourth Armor • Falcon Armor • Gaea Armor • Blade Armor • Shadow Armor • Glide Armor • Neutral Armor (Icarus Armor • Hermes Armor) • Ultimate Armor|
|Black Zero • White Axl|
|Rockman X Mega Mission armors|
|Clear Armor • Replicapture • Energy Armor • Neo Armor • Giga Armor • X Armor • All X Armor|
|X's armors • Zero's Forms • Hyper Mode|