well you can look through the bestiary for good bots to go against. i recommend either first trying eco bots or interesting behavior bots to go against till you find one that it can't beat very well. you can also try having it beat itself for a bit too to find a good balance for it's self and to help randomize up the code a bit for better mutations down the line, hopefully. after that you can slowly evolve up the chain to harder and harder bots. however if you want to evolve a bot against a specific trait such as poison or venom it might be best if you make another bot for that purpose, most bots in the f1 will likely use dirty tricks as such or worse so i recommend going after them last. well the choice is yours. have fun. we would like to see what you come up with. if you need further help don't be afraid to ask.