Must have Heart Tanks, Sub-Tanks, enemy weapons, and power-ups. Then, go to Armored Armadillo's level. Reach the final mine cart, which makes you launch you through the air at the end of the level. Just before you reach the wall, jump up and climb the wall. At the top, there will be a large Energy Unit . Get it, and then jump into the pit and die. Repeat this step five times. On the fifth time through, a capsule will appear on that same ledge. Dr. Light will then give you a Ryu-style fireball for Mega Man to use.
Zero's Arm Cannon is the same as the Arm Upgrade for X, but much easier to get and a little bit stronger (well not sure if it's stronger or has the same power as the Arm Upgrade). To get Zero's Arm Cannon DON'T GET the Arm Upgrade and get the rest of the armor (not sure if you need the other armors though). Go to the first Sigma Stage where you fight Vile and defeat. Walk over to Zero and he'll give you his Arm Cannon. Now you have an Arm Upgrade part, which will grant you to get the Hadoku (or Fireball attack, can't spell) as well.
In second area of Doppler's fortress, the glass in the background should be intact if Vile was destroyed (otherwise it will be broken). Make it past the area filled with water and, before entering the sub-boss gate, switch to Zero. Enter the sub-boss room and defeat the sub-boss. Make sure the final blow is dealt with Zero's Saber. (Just fully charge up, shoot it twice, wait for it to come down, then dodge and slash it.) It will slowly move up then go kamikaze on Zero. X will then teleport in after the whole exploding sequence, and Zero will hand him the Z-Saber. To use it, just use it like when Zero was using it: Charge up to green, fire two Buster shots (still combinable), then push the attack button for the slash. Note: With the Buster Upgrade, X can launch a sonicboom with the Z-Saber, which, if landed on an enemy that doesn't get instantly defeated, will deal extra damage on the enemy for up to 4 times. One single shockwave can take off approximately 2/3 of a boss' life, INCLUDING ALL versions of Sigma, provided that the hit did land.
Before reaching Dr. Doppler's fortress, collect all 8 Heart Tanks, all 4 E-Tanks, all 4 Ride Armors, and all 4 Armor parts, but NONE of the Armor Chips. In the first area of Dr. Doppler's fortress, when you reach the Ride Armor Pod, get into the K Ride Armor. Make sure your life gauge is full. Keep moving forward until you see this place where there are bottomless pits and iron balls are being dropped from the ceiling. Get out of the Ride Armor and slide down the left wall of the first shaft. Eventually you will enter a hidden path, and reach a red Capsule. Enter it and you will receive all the Armor Chips' effects, plus a damned cool-looking GOLDEN Hyper Armor. Chip Effects: - Head: Life Refill. Stand still and your life gauge will be slowly regenerated. This effect works with E-tanks as well, as long as X's life is full. - Body: Enhanced Protection Field. Reduces even more damage after X has taken an initial damage. - Buster: Hyper Charge. Select it on the bottom of the weapon list and you can fire the charged Buster for as long as the energy supply lasts. The energy can be regenerated by taking damage. Once it is used up, the weapon cannot be used until the energy is completely refilled. If you exit a stage, the weapon cannot be used in the next stage you enter until it is completely recharged. - Leg: Double-Dash. X can perform one more air-dash.
To reach the Dragon Punch, you must have all Heart Tanks, power ups, and Sub-Tanks. When you reach the two ladders, one unreachable. Lead the bats to the ladder and crystalize them to reach the top ladder. Then use Speed Burner on the first set of spikes and air-dash between the next spikes. Go to another set of spikes. Charge up Speed Burner again and air-dash the first set and drop to second set and Speed Burner to the left to reach the 1-Up. It may take several tries, but you'll make it. Slide down the left wall and you'll find the Dragon Punch capsule. You MUST have a full energy meter to get this capsule.
To execute the Dragon Punch, press Forward, Down, and Down-Forward and the fire button.
Before each level in Mega Man X5, you're given a choice of which character to use. You only have X and Zero available to you at the start, though you can unlock a third character of sorts right when the game begins.
If you begin the game as X, you'll automatically unlock the Force Armor, a replica of a fully upgraded X from Mega Man X4, as being available to use in the game's levels. Given how difficult Mega Man X5 is, the Force Armor is a nice recourse to use should you ever get stuck -- though it's recommended that you only use the Force Armor if you're truly stuck, as it takes virtually all challenge out of a level when you decide to use it.
Get three sub-tanks and make sure one of your special weapons has less than full power. Then, with the weapon that has less than full power selected, grab a weapon capsule and immediately hit start. If you did it right, you'll have a fourth sub-tank. Fill it using the same method, just don't over fill or you'll delete it and your third one. It recovers health just like the a normal one.