So much fun for a game from 1999 ;)
Or you can go to the shrine and get a monster from a CD or PS game. You can get from a possibility of over 200 monsters at first.!! Once you choose a monster you can take it to the Ranch. There you can train it by doing a Drill or Errantry . Drill is a simple well... drill. To raise it's Lif. Pow. Int. Acc. Spd. and Def. (Life Power Intelligence Accuracy Speed and Defense) Or you can send them to Errantry which is much more advanced and could teach your monster a new move. (Not a good idea to send a new monster) But beware you could run into a WILD MONSTER when you complete the Errantry.
Once you have raised your monster you can enter it into a battle.
You have 6 ranks. They are E, D, C, B, A, and S. Each time you win a tournament you get fame. I am still not sure what does though. You must win the Official Tournament to get in the next rank.
Once your monster gets really old something happens and it's not funny. (but i could be playing LOL LOL )
Hope you buy it soon!!!