plus items come from materials you get from High Rank Quests.
High Rank Quest comes from the middle quest-giving-lady inside the gathering hall.
It's the high ranked quests that give you them.
no you must fight high ranked monsters online
they are suply items
4*+ Elder quests. If I recall correctly, the Green Plesioth awarded Monster Bone+.
monster hunter wiki
that would be Monster Hunter Freedom Unite on PSP and Monster Hunter Tri on Wii.
You can find those items in one of the quests (higher rank) of the lady on the middle in the gathering hall.
No one in the world can sensibly be a monster hunter as monsters aren't real. However, there is a video game called 'Monster Hunter' and it is popular and one can become a monster hunter through there.
I will answer any monster hunter questions you have :)
You can get that and more on the monster hunter wiki
There is no way to get invincibility in Monster Hunter Freedom.
Monster Hunter Tri happened in 2009.