Since you gave me the opportunity to bother you some more, I'll have to use it

I can't find Wantz in macalania woods, any solution to this?
I think i read something about it, saying that if i talked to him at mt. gagazet the first time you meet him, he will not show up in the woods. Is this correct?

And if, what monsters can i defeat to get a weapon with 4 empty slots?