all amazo has to do is look at doomsday and he has his power. with a horde of other powers. then he beats doomsday.
doomsday comes back stronger, but amazo adapts to his new level of power again. plus having a horde of other powers.... so he beats him again.
doomsday comes back stronger again.... and so on and so on.
amazo should be one up on doomsday everytime cause all he has to do is look to adapt.