I hope that nobody uses this as evidence that tiers mean nothing, because it isn't. First, you're playing against the kind of guy who takes a whole battle to realize a team is monotype, believes that Wish + Protect stalling with Umbreon is more of annoying tactic than Jirachi Iron Head flinch spam, and is either Choiced on that Jirachi or doesn't recognize a simple pattern (I'll give him a Choice Scarf/Band just to be nice).
Tiers are alive and well, it's just that the intelligence of the player plays a far bigger role.
Generation (pi)(i). When you see this, raise e to the generation and add 1. Social experiment.