Well You can easily beat it by this way if you are biological and have up lvl 10 get the hability ob subversion and when its reecibing healing in this case will recive damage, another good way is by stunning it and hitting then stunning and hitting very easy
or an easy way too is to defend yourself dont attack just get sure that your life bar and your partners dont die, every time he gets out of focus he will use and ability to restore it but it will cost him health when he has almost mid bar of life he will use tick tock on himself getting killed lonely
if on sonny 1 you can beat him easily by stunning and hitting..and also do not let him gain 100 focus...also kill the 2 ghosts on sonny 2 try a class that can drain his focus fast so he will use abilites that will make him suicide