It's impossible to say when an equipment is right, it's all about skill, I can kill a G-Rank Azure Rathalos without being hit once, only using my trusty Lacerator Blade.
Just try out different weapons, remember, all of us should go through the process of picking the right weapon and armour for each mission, I know I did, and I learned that Hammers own:
A) Silver Rathalos
B)Gold Rathian
C)Fatalis
D)Lao-Shan
E)Daimyo Hermitaur
F)Shogun Ceanataur
SnS easily kill all Elder Dragons (including Kirin) and Lao-Shan if you have Azure Ogre Sword
DS is really about skills, but they only get useful when you can make G-Rank DS, and then, you can kill Fatalis
Lance, I just suck with them, but I can assure you one thing: They do not kill Rajang in the training school >_>
Gunlance, I just use Gun Charioth against Akantor
GS, for me, the weapon of choice against all monsters, except Kushala Daora (Damn you Wind Barrier!)
Again, I learned this by myself, just make your own chart of weapons to use
MHF2:
Armor:Full Rathalos Soul U (400, BladeMaster)Full Death Stench S w/B.Piercing(212,Gunner)
Best Weapons: Azure Ogre Sword, Onslaught Hammer, Lacerator Blade, Akantor Bow
What?!Fatalis webbing?! I'm one person and I can only Sword it it, so bye-bye Full Dragonskin...