Mega Man ZX Unlockables
Keep Model X
Complete the game with both Vent and Aile on Normal or Hard difficulties and save their "Cleared!" save files. Now, when you play through a New Game again as either character, you'll keep Model X after acquiring Model ZX.
Biometal O / Model OX
The secret area N-1 houses one secret boss from Zero 3- Omega Zero. People who played that game know that this guy is using Zero's "origional" body. Anyway, once you take down this guy, go to the area where you can fight bosses from Zero 3 and 4. Take the third door and follow it through. Eventually you'll reach a strange stone that looks alot like a live metal.

Go to the lab in X-1 and talk to fluub (in the Lab area). After the game, he'll analyse it and find out it's a live metal, letting you use Model OX.

NOTE: You do NOT have to beat the 8 bosses from Zero 3 and 4 to fight Omega Zero or get OX.

In conclusion, Unlockable How to Unlock
Model OX Beat Omega zero in area N-1 and find the live metal. Take it to fluub to get OX

Unlock Hard Mode
Beat the game once on “Normal Mode” in order to unlock the extraordinarily difficult “Hard Mode.” Unlockable How to Unlock
Hard Mode Beat the game once on Normal Mode

Boss Plushies
Beat a Boss with a Level 4 victory. This means beating the boss without ever hitting where their Biometal is located. The Plushies can be found in Prarie's room in the background. Unlockable How to Unlock
Hivolt Plushie Beat Hivolt while avoiding to hit his wings
Hurricaune Plushie Beat Hurricaunce while avoiding to hit her neck
Lurerre Plushie Beat Luererre while avoiding to hit her head
Protectos Plushie Beat Protectos while avoiding to hit his chest
Leganchor Plushie Beat Leganchor while avoiding to hit his head.
Fistleo Plushie Beat Fistleo while avoiding to hit his head
Purprill Plushie Beat Purprill while avoiding to hit his arms.
Flammole Plushie Beat Flammole while avoiding to hit his arms.

Arcade mini-games
There is an arcade next to the transerver in Area C-2 where Vent or Aile can play mini-games. At first, none of the games are active, but by completing certain tasks within the game, you will be able to play them by pressing Up next to a lit screen. Unlockable How to Unlock
Crusher-F Defeat any two bosses
Mega Crusher-F Beat the high score on Crusher-F (100 points)

Mega Man ZX Easter Eggs
Purpose of the doll
The doll in Prairie's room isn't just there for decoration or to attack just for fun. If you continually strike the doll with attacks, in time it will drop a "W Can." The "W Can" or Weapon Can refills all of the weapon energy for all of the Live Metals. The doll will only drop it if you don't already have one. So return to the doll after you use the W Can to get another one. Cutting the doll from its string makes obtaining the item much easier.
Megaman Zero 3 and Megman Zero 4 bonus
If you insert either a copy of the GBA Megaman Zero 3 or Megaman Zero 4 in the GBA slot of the DS when starting a game. The bosses that were found in the GBA versions will be found throughout Megaman ZX. Do you have what it takes to defeat them?
Get A Birthday Cake
Change the day to your birthday then go to area c-1 and take to Sherry, Sherry is in one of the building that has a dark door. Cake restores 8 points of life.