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According to Wikipedia, the game WrestleFest has codes that can be used to play as the Legion of Doom who are normally NPCs. Wikipedia also says that there is a code that can be used to play as separate Demolition members who can normally only be chosen together as a team.

Does anyone have these codes?

I've looked all over Google but no luck.

In WWF Wrestlefest you can select all the wrestlers you find in the game except Animal and Hawk, the members of the Legion Of Doom. However you can get them if you have the MAME Cheats :hooray:
First of all when you start the game go to the cheats and select Hawk and Animal (or vice versa) in "Select 1st Character" and "Select 2nd Character" if you are about to go to tag team matches or just one of them if you are going to Royal Rumble: Then select any character you wish, you'll see that there's no problem: I did it this way on my modded Xbox with Mame. Start the game, insert your credits, select either Royal Rumble or Tag Team, Select player or players, As the chararacter is walking to the ring pause the game, go to cheat screen, select the enable/disable cheat part, scroll down to find Hawk or Animal to set as first character, press set or press green A button on controller, exit cheat screen, unpause game, and when your character is in the ring it will be either Hawk or Animal character that you selected as first character in cheat screen. Hope this helps... It may seem long but it isn't and it's easy...

I'm a little confused. Do I need to enter the Hawk/Animal cheat somewhere or should it automatically be in MAME?

have you tried pugsy's cheats (http://cheat.retrogames.com/)