These scripts are completely useless since you are not including any documentation.

 if ($hget(digimon,$nick) != agumon) {
  elseif ($hget(digimon,$nick) != gomamon) { notice $nick only agumon and gomamon can use that attack! | halt } }

completely invalid piece of code.

if ($hget(digimon,$nick) != wormmon) { notice $nick only biyomon can use that attack! | halt }

even you got confused in your own code.

 if (%player1stamina < 6) { notice $nick you can't use $1 because you don't have enough stamina! | halt }
  if (%player1stamina > 6) { 

pointless you are making 2 check since you can make only one

 if (%player1stamina < 6) { notice $nick you can't use $1 because you don't have enough stamina! | halt }
  else {

Also on your attacks you are only checking player1stamina, while you dont know which of the players triggering the attack...
Fix your code and then post it