JOEL - John the Revelator describes what an antichrist is:

"He is antichrist, that denieth the Father and the Son." (1 John 2:22)

An antichrist is anyone or anything that counterfeits the true gospel plan of salvation and that openly or secretly opposes Christ. Antichrists have been identified throughout the scriptures. (1 John 2:18,22 4:3, 2 John 1:7, Jacob 7:1-23, Alma 2:1-16, Alma 30:6-60)
The great antichrist is Lucifer, but he has many assistants, both spirit beings and mortals.
One way Satan will show himself is through the appearance of his many assistant antichrists, who will begin to appear in the last days, including the growth of the church of the devil. What Satan himself will look like is something we don't know.

RICKY - Should a mormon believe a psychic? And if a mormon becomes one, will he or she be judged? Are psychics evil?

JOEL - I would not say psychics are any more "evil" than anyone else, but the Bible does have something to say about it:

"There shall not be found among you any one that maketh his son or his daughter to pass through the fire, or that useth divination, or an observer of times, or an enchanter, or a witch,
Or a charmer, or a consulter with familiar spirits, or a wizard, or a necromancer.
For all that do these things are an abomination unto the LORD: and because of these abominations the LORD thy God doth drive them out from before thee." (Deut. 18:9-12)

Psychics and mediums do not work under the influence of the Holy Ghost. Regardless of some who have sincere intentions, many are either frauds or they are influenced by Satan to learn the things they find out about people.
There may be some people who truly have a super-sensitive gift of perception or understanding of human nature and because of this are able to help some people; but it is much better and safer to live by the spirit of Christ and have the faith to ask God for help instead. Church members should go see their Bishop before trying a psychic.
Personally I don't know any Mormon psychics, except of course for my mother. She always seemed to know when I was getting into trouble :-)