I'm Hr-1 and i need help to get the following items :-

monster bone+
para sac
hercudrome
hrd armor sphere
vibrant pelt

plz if u know how to get all or some or just one than tell me

You can get the vibrant pelt from Congalala. I'm hr2 and i don't know about other items.

Here are the easiest ways of acquiring the items:
Monster Bone+: Yian Kut Ku (Capture it for highest chance)
Para Sac: Gendrome
Hercudrome: Insect Thicket +2 or HR4+ gathering quests
Hrd Armor Sphere: Mining Spot +2 (rare) or combine Carbalite Ore+Armor Stone or Armor Stone+King Scarab
Vibrat Pelt:Congalala village; break it's mohawk (rare) HR4+ Congalala (common)

Thx guys i wanted to also know that that how to defeat rathian or rathalos.

Monster Bone+: HR3 Yian Kut Ku; it is impossible to get it until you get to HR3 or high level elder quests.

Rathian - attack its head when it's spitting fireballs
Rathalos - attack it when it lands after going airborne

quote Bowgunner

You can get the vibrant pelt from Congalala. I'm hr2 and i don't know about other items.

hey thx for telling me how to get hercudrome in hr but i found a better way, to get it from the volcanic zone

Oh yeah, elder quests in Volcano have Hercudromes in the thicket.