By the way what's the exact meaning of "cannot be disabled once used"? Does it mean it stays until I close the game or really forever (unless I delete some data file)?
The "Cheats" section words it slightly wrong. You hold jump and fire on the title screen to activate both abilities. In order to use the Genin Jinn ability, you press fire and switch-weapon right while in an actual level. By "Cannot be disabled," it just means that the ability will stay active until it runs out of energy.
Yea I submitted the hidden abilities codes. for some reason the idiot in charge of putting them up messed it up somehow. a complete detail of every codes/secrets can be found on my thread. it's called Tips/Tricks/Codes/Easter Eggs
Hidden Abilities Code: "Have the ability to use Hadoken manually without any meter or defeating Ryu." "Have the ability to use the Custom Combo system from the Street Fighter Alpha series."
On the title screen, where it saids, "Press Start," press and hold your assigned "jump" and "fire/shoot" buttons for about 5-6 seconds until you hear a chime noise. You know, you did it right if you select a stage, and you'll noticed that there's a weapon's energy meter next to your health meter.
To use Hadoken: Do a Hadoken motion from the Street Fighter series. Down, down-forward, forward and your assigned "fire/shoot" button. Everyone should know how to do a Hadoken, it's kinda hard to pull it off here though :/
To use Custom Combo: Press your assigned "fire/shoot" button and your assigned "swap #1" button (it's the left button that lets you change weapons in real-time). Pro-tip: Just keep mashing those two buttons until you hear a noise, and you'll noticed that Mega Man is leaving a trail of shadows as he runs.
*The Hadoken functions exactly like the Hadoken weapon. If you hold the fire/shoot button after doing the command, you can charge it up for the same effect as a charged hadoken.*
*The Custom Combo makes the game significantly easier. Mega Man leaves a trail of shadows as he runs. You'll noticed that Mega Man jumps higher and move a lot faster now. Plus your attacks has been doubled!* Just find out for yourself. Once you activate, the Custom Combo, the weapon energy meter gradually gets depleted, but most stages are generous enough to have an abundance of weapon energy capsules lying around.