Lavis Cannon, Heaven's Punisher and all the rest

[RellikTakahashi]

Are they IN GC?, If so, How do you get them?

What are the Ultimate Hunter, Ranger and Force weapons?

[TeamPhalanx]

They're all there... and still uber-rare, so don't bother hunting for 'em.

The easy answer for ultimate weapons would be the ones made from Olga Flow's DNA

[AMP]

Lavis Cannon can be found in Skyly Ultimate Ruins.

[Saladwood]

chekc the item database, each item entry has the section and location findings for it