Thread:Linathan/@comment-28249988-20161104133440/@comment-26140304-20161105021231

Apologies for the late response. The current fastest way to level your weapon would be Mega Metal Parade. Since you're able to easily access crystals whenever you want, you can take advantage of this to farm as many crystals as you can to max out your weapons. It definitely takes a ton of Zel and energy to farm them along with some patience, but it's definitely doable. With this, I was able to max all three weapons obtainable in the game. As for other sources of leveling, Summoner and Element leveling just take a ton of time, even if you gem for energy.

Hope this helps! :)