thank you for your clarification.
anyone else can help me?
If you have to ask if the monte carlo method is good for equilibrating your system, are you sure you need/want to use a monte carlo method? I use nvt/npt to equilibrate my polymer systems. Why not use nvt or npt?
Learning to use Google (or other search engine) will save you a lot of time and effort. Googling “lammps monte carlo” gives some good information on lammps commands that deal with monte carlo methods. Also, searching the mailing list archive (https://sourceforge.net/p/lammps/mailman/lammps-users/, the search box is in the left-hand corner) should be the first thing you try before posting to the list. Someone may have already asked the same (or a similar) question.
Hope that helps,
Will