I just used my regular cartridge and phono amp, but some people swear by a special mono cartridge. THEY will need to answer as to what they hear.
The remastered mono versions are supposed to come out next year, so they can make more money. It may be a good time to get this record. Try to listen to it sometime in the future.
Btw, I do listen to the stereo Rubber Soul, and enjoy it, but sometimes, the stereo mix bothers me more than other times. YMMV?