GamePress
Most valuable mon for raid
I think egg is the one. With psy/SOB, deal with water, ground,rock,normal type boss, plus blissey. With psy/psy, deal with fighting, poison type boss. Egg tanks better than champ, last longer, hit harder.
I have no problem to kill 3k plus blissey with my 2400 cp egg. (Psy/SOB)