Oh, ok, that helps, lol, anyway, i just did some testin out stuff and i figured out that the best weapon to use for tigrex is Long Sword, not sure if you use it, but it is the best choice.
Secondly, the best place to attack teh tigrex is the back legs or the head.
The hind legs do slightly less damage, but its is the safest place to attack.
Finally, use thunder. Tigrex got positive resistance for all other elements cept thunda, so use it. still waiting for you to give me some more info, dont leave a hungreh kitteh waiten.