Go to menu, tap academy and freeze 2 monsters that are at least a 1yr old and combine them using combine. You can also use a neighbor's and never use a second monster up. That's really only if you can find neighbors as skilled at the game as you, combining with weak monsters only hurts its potential growth.
Your face has monster rancher
Monster Rancher Explorer happened in 2000.
Monster Rancher Explorer was created in 2000.
Monster Rancher Advance happened in 2001.
Monster Rancher EVO happened in 2005.
Monster Rancher DS happened in 2008.
you can have up to 5 monsters in monster rancher 4
Monster Rancher Advance was created on 2001-12-07.
Monster Rancher EVO was created on 2005-12-08.
Monster Rancher DS was created on 2008-08-07.
Press square then monster.
Yes, it already came out actually, it's called "monster rancher DS".