nvm i beat him and i've been owning rathians and i have full rathian :D

Make sure you bring flash bombs, pitfall trap(much as you can), trap tool, net, some
antidotes and potions, trang bomb(necessary), whetstones, well done steak, paintball(to
tracks los movements),most important to bring small and large barrel bombs to gave los
some surprise. I'm also recommend you should use the grserpentblade or better to fight
los.

~~~but the most important, you should believe first that you can beat los!! ~~~

Notes: sorry for long instruction!!

You can kill rathaslo with vile sword.he turn into rage mode and stop attak rathaslo. When
he fast become slow and you will attack rathaslo but when he tired and he runaway to zone
5 and hurry you go to zone 5 before when he tired you run and you kill all down when he
come you will kill rathlaso be carefull. You will beat it. I beated him and catured him
and wait for quest: qureen of the sand. But i need a potion max and bring trap and large
bomb but i don't know how to use combie to large bomb. But how to play online pls help me
:( i want it

I beated it i have unlocked the movie. And i cannot play online its capcom cut serve off
:( why that cut it off?

You must use good blade known as sp i froget long name sorry and i beated all quest and i
have finish game before i never play online it's cut off :(

You need get sigeiumd has high attack is 814 is best blade to kill rathalso easy don't
froget use piftrap or flash bomb it do. I don't use flash bomb fight him xd. Also i froget
flash bomb and i was fight him long time. But i beated him! I did it! Did... You do better
with best aromr rathian and rathalso has very best aromr! I don't have this xd i need
thing this.