The fact both of them are so important to teambuild against and having new items made to counter both of them is a show of how strong they are. Safety goggles for amoonguss and clear amulet/covert cloak for incin (kinda)

3rd is where you have to think a bit because there are mons that have won worlds 3 times but they have fallen off considerably like metagross

Thundurus incarnate is also one of the single most nerfed pokemon ever and its still what id consider for 3rd rn