Falzar

Megaman Battle Network 6: Cybeast Falzar
Falzar or Falzer in Japan is a Cybeast in the form of a Phoenix who was created by an ancestor of Mayor Cain to destroy Cybeast Gregar. During their battle it went out of control and had to be sealed in the underground area with Gregar to keep them from causing damage.

They were both released when CircusMan.EXE tried to capture them both for Dr. Wily. He failed and MegaMan.EXE tried to beat Falzar by absorbing it. It took over MegaMan.EXE through Beast Out. The first time it did that, it rejected the Healing Water and nearly deleted SpoutMan.EXE in one shot. Dr. Hikari says after Falzar takes over MegaMan that whenever it awakens, there is a chance that it may take over MegaMan forever. Were he to take complete control, even if Yuichiro Hikari did everything he could, he may have no choice but to have MegaMan be deleted forcibly. But he didn't, and MegaMan obtained Beast Out. It is later forced into a giant CopyBot and is deleted.

Falzar is the final boss of the Falzar version, and its side of the screen has no panels. Ground-based attacks are ineffective against it, as are areagrab chips, and Ground Cross will only travel as far as the front of your area. Its normal version has 2000 HP, its SP 3200 HP, and RV 4000 HP. It is capable of the following attacks:
 * Sonic Wave: Falzar moves up to you and fires a T-shaped tornado, like Tengu Beast's chip charge attack. This removes auras and barriers.
 * Firebird Breath: Falzar stays in the middle of its area, and creates three balls of fire. The fireballs will summon phoenixes that will fly at you if you stand in front of them. The phoenixes can be destroyed when hit hard enough.
 * Strike Feather: Falzar flies so high that it cannot be hit, and creates a Wind effect that will blow you back, and remove barriers and auras. At the same time, it fires feathers at your position.
 * Claw Shot: Falzar flies high enough to avoid being hit, and pummels the back 2 columns of your area with its talons.
 * Beast Hurricane: Used only in the SP version, Falzar turns around, and flies at you, first covering the bottom two rows, then the top two rows (may be vice-versa depending on your location) this attack will destroy any top chip you are going to use if you are hit by it.

MANGA
In the manga of Megaman NT Warrior in vol.13 Falzar and Gregar fuse with each other and become Cybeast Grezar.