By hunting a khezu, rathalos, rathian etc...
The first time I got any monster bone +, it was when I got 3 of them from one run of the 5* village quest "Small Shadow over the Swamp".
This isn't a question but a incomplete sentence, and there is no such item, bone, or weapon called big bone.
You can get them by killing monsters with shells in the dessert.
You get a large monster bone from the large monsters like the kut-ku.
4*+ Elder quests. If I recall correctly, the Green Plesioth awarded Monster Bone+.
Kill the things with spicky tails in the desert
You could just fight a monster from the Upper Rank missions in the Guild Hall.
you'll usually get that on higher rank quest monsters after you defeat them...
u go to the guy with all the food around him
you should have a male character first. the first one is your first armor in the game.... the 2nds is a bone great sword with a chain armor... last is a Rathalos Great Sword with Rathian whole Armor.
2 get hrd monster bones do high rank quests 4 example high rank cephadrome u can get at least 1 or 2 bones from it
you can get it in the jungle map number.5 there will be a large monster only need to hit about 4 to 5 hit if you using bone katana or iron katana and when you killed it you will need to press(circle) and some time you are lucky you will get monster bones or raw meat!
Easiest way is to trade Thunderbug to the old trader in the jungle. He may give you Sharp Claws sometimes.