Should I or should I not ? (DiGiMoN)

Hey guys . I was wondering if i should play a new game on digimon world ds.
I accidently choose wrong digimons and have already went far to the game . Now, my digimon team is all messed up and very difficult to win a match with other tamers and wild digimon.
So, should i or should i not play a new game?
I also want some advice for choosing a starting digimon.
Please help as soon as possible!
Thanks !-WaRaChia :)

train all of your digimon first.and you will easy to beat the game.

or you cold just get cheats if you are able to, but if not, i suggest starting a new game so you can train better