If you are able to dodge weight of the land and landslide, there is really only one difficult thing about the Titan Ex fight: bombs. You must know how to handle every type and layout of bombs. The one thing I see people doing terribly wrong all the time when bombs are involved is moving incorrectly, getting hit by the bomb they're standing on, then moving again to a different set and getting hit again. If you get hit by a bomb and survive, stand still dammit as you're now in an open spot!