He is right but a fire weapon will rip him apart
Well there is no best weapon but i find a weapon that can block does relatively well against this lightning beast. You can block his lightning that emits from its body by using a lances shield but other then that you should be fine if you try and avoid its attacks and then attack it when you have a chance.
use a saber or a wyvern blade maple.just use fire elements for khezu.
get kut ku stave bow. Dodge his attack charge bow and shoot. Use this so you can easily dodge its attacks, and have a good offense against it! A bowgun also works well on him. (use the Craig and clust)
go to gamefaqs.com or gamespot.com
buy another skilander
slaying in Monster Hunter (MH) means you kill the boss/biggest/required monster in the quest using your weapon. after that, you can "carve" for its parts by pressing "O"
If you hit a monster you automaticly do damage to the monster if your weapon has affinity every coupple hits (depends on how much affinaty) if your weapon slightly bounses off the monster and there is no blood this does not mean that you have done no damage it means it was reduced becasue of the lack of sharpeness of your weapon
Hunter's Knife
This isn't a question but a incomplete sentence, and there is no such item, bone, or weapon called big bone.
Go to google and type in: monster hunter freedom 2 wikia click on the first link. It has everything you need: armor materials, weapon requirements, quest walkthroughs , item locations etc
range weapon, meelee type longsword wait for it's taunt (standing) and hit it in it's face
The best to use is a Water element Lance, or use a bow that has a level 2 or up piercing range that has a water element. I made a link for additional help.
good weapons are hard to define in monster hunter. Many of them have their ups and downs. Even weapon type matters. Hammers are better for monsters with tough hide then longswords or dualblades etc. You can find a list of all the weapons,their stats, and how to make them at www.gamefaqs.com
search the web for good weapon path and then decide which one to take and then start by buying it's basic weapons. that way you wont waste money on cheap and unupgradable deadends.
Hit then roll, with a longsword not greatsword and if you have a decent cat... I've got one which is hacked named Fay can kill anything in about 2 hits XD Depicting on the monster, the best way to beat a monster get a weapon that has its weakest attribute if fighting a giadrome using a fire elemnt weapon will easily beat it. Also it depends on which weapon you like i find the bow to be one of the ultimate weapons.