What is the photon-avalanche thing that lets you fight gorea 2 pleas awnser..

The photon-avalanche thing???? Do you mean the Omega Cannon that's on the top of Oubillette? If so all you have to do is continuously hit him with it. It's extremely hard to hit him because it's so slow. I don't have any tips for defeating him except to be patient. Hope I helped.
Acgmindmaster12

Before you beat Gorea you have to shoot the things on the wall in the correct order. Yellow - voltdriver, green - battlehammer, magmaul - orange, schock coil - blue, judicator (my best weapon) - purple, imperalist - red. To beat Gorea2 jump to the bottom for a new weapon. It is the only thing you can use on him. Fire away!

Its the tri-pronged different colored things on the wall shoot them in the right order...and you will fight gorea 2.

Photon Avalanche cannot really be explained...since it isn't really an object or hting either..But to activate it, you must shoot all of the targets on the wall. Each one represents every other weapon that you hold. So, in htis order, you shoot them:
1: yellow = volt driver
2: green = battle hammer
3: orange = magmaul
4: blue = shock coil (HINT: you must jump high to be able to hit the target)
5: purple = judicator
6: red = imperialist

Then beat gorea and it will activate. You will then go on to Gorea 2.

Hope this helped!
Koolstr

Ok to get Gorea 2 you have to hit the colored plates around the level against Gorea 1 and the right order is:Green,Yellow,Orange,Purple,Blue and Red.(They are the same color as the weapons.Then you should be able to fight Gorea 2.I hope I helped you.

~skyline_2fast_luffy~