Heres how i did it (takes a few tries)

1. turn into swampfire
2.hit him with fire blast when he isnt attacking you
3. run as fast as you can from his ground hits or belly bumps
4. when he spins jump two seconds before he gets to you (DO NOT ATTACK)
5. when he gets his laser stay so that you can see him on one side do not move from your
side.
6. before he fires get him with fireballs then duck when he fires.
7.get through the rest of his attacks like instructed above

then you win!! trust me the next boss is much harder

i beated this one very hard;
u can try humangosaur or swampfire they are very good

This is what you do get the Bost thing on swampfire and then do what red24candy did.

vunerable with eco eco

all you need 2 do is use an action replay or do all of the stuff every body else said
cause all of it was right :)!!!!!!!!!!!!!!

choose chroma stone then use YYA OR YAA.surely one hit KO.

smash the bastard over the head with echo echo's hammer that should do the bastard a
*** heavy load of damage. fuckin' rock and roll

when you fight him you don't have Chromastone yet.Echo Echo is the best.

I already beat the game all boss are easy and the last lvl of the game is very easy

But you should really use echo echo the fastest way to kill gorvan the fourarms

See, every time he attacks, he takes a break for about 2 seconds. If u use Goop, then when
you attack the four arms guy, you use the "A" button. Use it when he takes a break.

I had trouble with this boss also. I used echo echo.He works the best