If you want a legendary weapon that isn't really hard to make, get an iron sword, then evolve it through the buster sword,+,blade. Then make it into a defender, sentinel, halberd and eventually the beasty weapon-Judgement (you will need to get the mining point 2 upgrade on the farm in order to get carballite ore and to get monster bone+). All you need to do is one of the gathering hall (catch a Yian Kut-Ku mission) as this is the easiest way to obtain them).

The stats for the Judgement sword are:
Attack 1104
Sharpness 1/10 red, 1/20 orange, 1/5 yellow, 1/5 green.