>>38148221snorlax has a combination of STAB boom, special tank, physical presence, status absorber, and win condition in gens where there were no real options.
There's too much to choose from and the metagame is too wide to have something be that dominant now because it would get banned from OU
The only proven staples for current OU across several gens i can think of are lando-t, heatran, ferrothorn, and maybe zapdos