Recommended Boss order
The following is the recommended order of Boss to take on based on weapon weaknesses. Note: Vile is weak against Yeti's ice weapon:
Gigavolt Man O War
Use the following Boss order, with the corresponding weapon weakness:
Optic Sunflower (Green Spinner)
Dark Mantis (Shining Ray)
Avalanche Yeti (Shadow Runner)
Burn Rooster (Drift Diamond)
Gravity Antonion (Melt Creeper)
Earthrock Trilobyte (Squeeze Ball)
Gigabolt Man-O-War (Crystal Wall)
Bamboo Pandamonium (Thunder Dancer)
Vile (Drift Diamond)
Copy Sigma (Shadow Runner)
Lumine, Angel form (X-Buster)
Use the following Boss order. Each Boss' weakness is the weapon acquired from the Boss listed above it. Though Earthrock Trilobite's helmet is destroyed by the gravity weapon and it does more damage, attacking with guard breaking moves (full charge, third swing, eighth shot) will only knock the helmet off and he will be vulnerable while he tries to return to it:
Earthrock Trilobite (weak against Guard Breaks or Gravity Weapon; harder as he is not distracted)
Gigavolt Man-O-War (weak against Avalanche Yeti)
Successfully complete the game and load your cleared saved file. The navigator used most to complete the levels will be unlocked (Alia, Layer, or Palette). Alia is similar to X with an X-buster, but cannot use armor pieces. Layer is similar to Zero with a Z-saber. Palette is similar to Axl, but has no DNA-copy abilities.
Successfully complete the game and load your cleared saved file. You can buy Zero's Sigma-Blade at the R&D Lab.
Avalanche Yeti stage: Rare Metal and armor piece
After you defeat the mini-Boss the second time (use Axl and Zero with Palette as navigator), Palette tells you that there is an ice path on the top pf the ledge. Go up there with Zero, then use Axl to hover over to the left to get the Rare Metal. Go back to that stage with X and Zero. After defeating the mini-Boss the second time go back up the ledge (before going to Avalanche Yeti) with Zero. Melt the ice with either weapon obtained from Optic Sunflower, then switch to X to get the Helmet H armor piece.
Optic Sunflower stage: Fight Cutman
Start the game with a Mega Man X: Command Mission saved game file on your memory card. Immediately before you fight Sunflower, you navigator will say something about a signal marked "CM". A portal will open, and you can fight Cutman. He can be killed with a charged Buster Shot.
Pitch Black stage: Rare Metal
After you start the generator, continue with the stage. Wait until you get to the end of this room. Do not go through the door yet. Because the lights are now on, you will see two platforms above you. Note: The second one may be difficult to see.Use somebody that can jump high to reach the Rare Metal on the second platform. After turning on the generator with Thunder Dancer or the Plasma Gun, walk out of the room you are in. Instead of falling to the lower level, double back where you came from. Notice that there are ledges to jump on top of. Use Zero to keep jumping the ledges to get to the Rare Metal.
Bamboo Pandemonium stage: Leg Part I for X
To get this, Ride Armor and Zero are suggested. After you get past the trap room (where you fight all the Ride Armors), kill everything here. As Zero, take the Ride Armor up on the elevator, hover over, air dash, then finally jump out and do a double jump. If done correctly, you can switch to X and get the part.
Bamboo Pandemonium stage: Rare Metals
First, copy the roller guy with Axl. After you get past the elevator with the armor opponent, there are two elevators. Keep on the left elevator for two seconds then jump off. Get out of your Ride Armor and at the bottom there is a small hole. Use the ability from the roller guy and go through the hole to get a Rare Metal. Then, keep the Ride Armor and have a Prickle Barrier . Go through the spike floor and the elevator will move. You can now get another Rare Metal.
Earthrock Trilobite stage: Armor capsule
To get past the canisters and get to the Armor Pod, you need the weapon acquired from Burn Rooster. Just shoot and get the armor.
Gravity Antonion stage: Zero's Rare Metal
Zero's Rare Metal is found in the Gravity Antonion stage. Use Axl and Zero, with Layer as Navi. Copy the DNA of the characterswho walk and dash on spikes. It is in the room after the Skipe Block mini Boss, not right after. It is about the third room after, in the far lower left corner.
Noah's Park stage: Buster capsule to X's Neutral Armor
After you complete the Noah's Park stage, return there. The door is now open at the place where you jumped up to continue.
Noah's Park stage: Rare Metal
When you have the Icarus Armor, go to Noah's Park stage again with Pallete as navigator. When you get to the room where she says "Find a way to break those rocks above you", jump up and hit the rocks with the Icarus Armor. Up there is a Rare Metal. Have Zero and somebody else, and Alia as navigator. At the first waterfall she will say there is a ledge that you can jump up to. That is where the Rare Metal is located.
Easy combo multiplier
You must have the D-Glaive Weapon for Zero, the Rasensetsu (the weapon obtained from Dark Mantis). Enter a level with Zero and look for a the enemy that shoots three rockets at you at the same time. Equip the D-Glaive and stand far enough from the enemy to where you will not kill him, but will still be able to get him to shoot rockets at you. Then, perform the spin attack obtained from Dark Mantis in mid air. After awhile you will rack up a large number of combo attacks.
Alternate ending sequence
There are 3 characters and the character that kills Lumine (Axl, X, or Zero) will determine which ending sequence appears.
X's Ultimate Armor
If You successfully complete the game with all of X's metals and all eight armor pieces.