Mega Man X8

Easy Metals:
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Submitted by: Haspa

This trick requires a Life Tank, but it does not have to be full. 
Spend all your Metals until you have less than 50. After that, buy 
the Life Charge Chip. Normally you cannot buy it if you do not have 
more than 50 Metals. If it works, you will see the Metal counter get 
crazy. You can now buy anything at the R&D Lab. If you take any Metal 
on a stage, the metal counter will drop to the top (9999999). 

Easy combo multiplier:
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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. 

Zero's Sigma-Blade:
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Successfully complete the game and load your cleared saved file. You can 
buy Zero's Sigma-Blade at the R&D Lab. 

Defeating Bosses:
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Just have both character's life at full and perhaps a Life Tank. You can 
kill every Boss with only the Buster and Saber. 

Bonus characters:
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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.