Added Fangs Weapons.
Update: 3/23/10
Added Sazhs and Vanilles weapons.
Update: 3/24/10
Added Snows and Hopes Weapons.
The Why
Every Weapon and accessory in FFXIII can be upgraded through components. (See here for some info) and when you max out their levels, you can upgrade that weapon | accessory into a better form using transformation Catalysts.
But the prices on those Catalysts are obnoxious in FFXIII. So you really can't experiment by buying up weapons and catalysts and seeing what goes where with which.....
The How
So with that in mind, here is a list of weapons and
Weapons
All Weapons Come in a 3 part series. 1 weapon You can buy. A unique version of that weapon it upgrades too. And an ultimate version of that characters weapon type. The Ultimate weapon is always the same, but it's stats are based on the 2 weapons previous in the series the Ultimate came from.
All weapons have max levels. These go 21/41/100 or 26/61/100 in the series. With all Ultimate weapons being capped at 100. You need to get the weapon to this level before you can upgrade. (with the exception of the Ultimates of course.)
For ease of reference. And a handy way of telling if you are pumping tons of Gil into trash, I posted the weapons Max Stats and any special auto abilities the weapon may have. The stats are ordered by Strength then Magic in all cases.
And Finally, I added what Transformation Catalyst (T-C) the item needs to be upgraded to the next highest form.