Was Snorlax relevant in DP? I didn't play that gen much but I can't recall ever seeing Snorlax when I did. Siding with Borat in this head to head... The way I see it, Tyranitar has gens 3 and 4 over Snorlax and Snorlax has gens 1 and 2 over Tyranitar, with GSC literally being Snorlax's metagame... and that being the difference as to why you'd go Lax over Tar... for the sheer dominance Snorlax has in the gen 2 metagame.
I think Zapdos is being a little underrated here as it's extremely relevant in gens 1-4. It never reaches a level of dominance in any one generation the way Snorlax does in GSC but few pokemon do (and when they do now, they get banned) but something needs to be said for the level of consistency Zapdos has had. Should easily be number 3 on the list.