Megaman X5 / Rockman X5

X's Super Nova armor:
Highlight X at the character selection screen, then press Up(2), Down(9). A sound will confirm correct code entry. Then, press Circle. Note: You will start with Super Nova Armor from Megaman X4.

Highlight X at the character selection screen, then press [Up(5), Down(2)] five times. A sound will confirm correct entry. Press X to continue.

X's Fourth (Force) armor:
Highlight X at the character selection screen, then press Up(2), Down(9), Up(2), Down(9). A sound will confirm correct code entry. You will have the Fourth Armor, which is a mix of the Ultimate Armor and the Falcon Armor. 

Alternately, highlight X at the character selection screen, then press Up(2), Down(2), Up(2), Down(2), Up(2), Down(2), Up(2), Down(2), Up(2), Down. A sound will confirm correct entry. Press X to continue.

Megaman's Ultimate armor:
Highlight Megaman at the character select screen, then press Up(2), Down(9). A sound will confirm correct code entry. You will start the game with the Ultimate armor and always have it for use through the rest of the game.

Zero's Black armor:
Highlight Zero at the character selection screen, then press Down(2), Up(9). A sound will confirm correct code entry. Then, press Circle. Note: Zero's Black armor will reduce damage slightly as compared to his Red armor.

Zero's Supreme Slash:
Either press Dash + Slash, or press Forward, Forward + Slash. Note: This is the best to finish some of the Bosses.

Zeros's Slash combo:
Press Square(2), Back, Square for a 4 hit combo which works on any Boss.

Zero's Flip-Slash combo:
Note: You must have most of the special moves you get from Bosses. First, use Zero's Lightning Upper-Cut (Up, Square), then press Circle while in the air to become invincible and dash through the air. Then, use his Flame Sword (Down, Down, Square) and if you are not on the ground yet, use your Square in the air to make Zero Flip-Slash. This combo is highly effective on Bosses.

Zero's unlimited Slash:
Press Left or Right (depending on which way you are facing) + Square.

Zero's Sabre Slash on Bosses:

Usually you can do up to 3 or 4 hit combo on any Boss. However, the Final Slash will paralyze the Boss for awhile, which prevents you from slashing it during this time. To avoid this, hit the Boss with a 2 or 3 hit combo and do not use the Final Slash. It would be better if you used Zero's Supreme Slash.

출처 : http://www.gamewinners.com/playstation/RockmanX5.htm