it's not possible to get Tonberry without getting odin. He has the 20minute counter. If you are playing a low level game then it shouldn't matter if odin comes out or not if you have encounter none. duh. It's impossible to have proper junctions to kill 20 plus tonberries in under 20 min. In my low level game my party was at an average level of 10 and gaining tonberry earlier was definetly more benficial for drawing magics, mugging from monsters, and dispatching human enemies. Also there are certain areas where only Tonberries appear so taking off encounter none should not be a problem. What i did was get odin and keep squall at near death. then I did like constant renzoukuken and Irvine just kept on doing his armor pierce shot to every single tonberry.