Just edit your post if you need to say sumthing more.
HHmmmm...... thats weird, Devil slicer + traps + flashes = Dead tigrex.
WRONG!!!! You need to have a moderate damage output. Spend less time getting hit and recovering and more time hitting it. Practice dodgeing its attacks, and try not to get stuck under it. I know your ready cuz i beat dat tiggy with 25 mins left with Devil Slicer.