The best way to level up your weapon is to kill lots of enemies and officers. Killing enemies helps too.
hahaha I have no idea:)
Get 800 kills in Hard Mode
There are no levels in weapons in Dynasty Warriors 6. So although there are weapons better than others, there is no best. The weapons you gain are based on luck, and the difficulty of the game.
On hard mode get 50 kills in 4 minutes
Get 100 kills in 3 minutes on hard mode
Achieve 300 KO Count in under 4 minutes on hard.
Get 100 kills in 6 minutes and 35 seconds on hard mode
You can unlock Zhang He's weapon by completing the level you're on using Zhang He and sometimes if you defeat all the emeny's during the battle you might unlock Zhang He's weapon.
Get 300 KO Count in under five minutes and win with the difficulty on hard
Achieve 100 KO Count in under 4:30 minutes on hard.
Don't let any one pass the bridge and kill all generals on hard
Kill Cao Ren, Zhang He, Xu Zhu and Xu Huang on hard mode