I remember hearing somewhere at about the time i just got the game that if you get a gold chocobo you are able to ride up a certain mountain then you go into a cave and you get the NEO Bahamut Materia.
Is it true?

O:] no, thats how u get knight of the round. u get neo bahumut before jenova death in the crater, near the save point.
to get bahumut ZERO, u must have all the huge materia. there one in rocket town in the rocket where u have to imput O, square, X, X before the time limit. then u go to cosmo canyon. if u have the blue huge materia, u get it.
u dont need bahumut zero, but u should really get knights of the round as it can do 70000 dmg at the cost of 500mp. u need it if u want to kill emerald weapon.

u can also kill bizarrosephiroth in one shot

Bit of advice BlackBahamut, your sig is way too big.

It is big but its also cool let dirge remake it for u and help slot in an ava

Or you could just have Dirge make you a sig/ava. His sigs/ava rock.

Amen to that.

Neo/Bahamut/Zero is my favorite Summon. Unblockable :-D