i would skip it, spend the time you would in the monster arena training up to get items to add better stuff. i mean.. only loss is the one aeon doesnt get BDL. there are better skills to customize onto weapons anyhow. triple overdrive isnt exactly a must (though cool as it is... it only takes 30 winning formulas), evade and counter is ok.. but there are better things (or you could customize with one teleport sphere) and magic counter just SUCKS. and IMO just having magic counter there ruins the whole weapon as it isnt very ultimate anymore i would prefer BDL+1 mp + whatever else floats your boat. maybe evade and counter +counter :P or put in triple overdrive.

main point being.. the weapon itself isnt really worth the effort if you tried and tried and still cant get it. (like some/alot of us here) want something ultimate? make it yourself!