Togekiss is a completely different story and had a 60% chance to flinch, and combined with its godly typing and the fact that it could boost
while it was bullshitting its way through the other team made it even more broken than Jirachi ever was and could turn games around in an instant by just being Togekiss. Mega Pidgeot is completely different because it only runs one set, doesn't get the chance to boost itself, and even if it gets that 30% chance it relies on a 50% chance past that for the opponent to hit itself- that's a 15% chance of taking away a turn for the opponent as opposed to a 60% chance. Not the mention Togekiss is bulkier, can run an item, and has a better typing
and has decent coverage past just Hurricane and Heat Wave.
On the other hand, I have always had a hard time analyzing Pidgeot's affect on the metagame as whole (looking past inherent brokenness for a minute) because it's not the strongest mon in the tier, it's not the most versatile, and it doesn't have qualities that are simply better than any other pokemon in the tier. The sole reason that Pidgeot is so good and is considered one of the best (if not the best) pokemon in the metagame is because it has access to the one move that all of its sets are based around, 100% accurate Hurricane. Hurricane's design is based around a move that is absurdly strong with a 30% chance to confuse the opponent (probably the worst status effect that's not Freeze) but that only hits 70% of the time, the same accuracy as Focus Blast, which means the pokemon that use it oftentimes find themselves missing more than they do reaping the rewards of obtaining such a strong STAB. The difficulty in assessing Pidgeot lies in the fact that it destroys the drawbacks of using the move- there is no drawback from clicking Hurricane because it
never misses, is only resisted by 3 types in the game, all of which are relatively rare in UU; there are only four Electric-types in the tier, two of which are 2HKO'd by Hurricane after Rocks, 1 of which is worn down easily with no reliable recovery and is weak to rocks and the other which is also worn down really easily. There are only 2 rock types in the tier and one of them is regular Aggron, and Empoleon is the only steel really capable of checking Pidgeot since everything else at least has a chance of being 2HKO'd by Heat Wave after rocks. I've always believed flying was a godlike offensive typing because its resists are so few and far between, so much so that after Jirachi moved up most UU teams didn't feel the need to pack a resist, because the only Flying-type worth noting was Mega Aerodactyl which could easily be checked by Swampert or Suicune. I think there's not as much of a centralizing factor in Pidgeot as there is an inherent brokenness in no guard Hurricane, because not only do you get a free chance to fire off a 110 BP STAB move backed by 135 SpA but you are also rewarded nearly
1/3 of the time by getting a confusion, and then the game turns into a series of 50/50s as to whether or not you get a free turn. If you take one thing away from this paragraph, take this statement as to why Pidgeot is inherently broken: It doesn't matter whether or not Pidgeot has counters, because even if you Hurricane into a Empoleon
you lose nothing and have a 1/3 chance to confuse the Empoleon and then have a chance to render it useless for turns at a time. All of its answers aren't planning on sweeping any teams any time soon (part of the reason why I voted no ban for Victini) because unlike V-Create there is no problem with clicking Hurricane. If you Hurricane into a Rotom-H, so what? Pidgeot simply switches out and Rotom probably clicks Volt Switch, getting the opponent momentum- it's not going to sweep you anytime soon, and even if it forces a sack by getting a free switch into a wallbreaker that's not going to lose you the game, like giving Feraligatr free Dragon Dances. There is literally no reason not to click Hurricane with Pidgeot and the fact that you have a chance to confuse the hurricane on top of it is what sets it over the edge.
Also, while I agree with some of
King UU's posts up above, I have to say that the opportunity cost of not using Pidgeot is not as absurd as you stated above; sure, Pidgeot is strong, but it's not the strongest pokemon in the tier. Your points are all true but they are somewhat exaggerated (very exaggerated, actually). Mega Pidgeot, Mega Aerodactyl, Mega Beedrill, and Mega Blastoise are four megas that I would almost always use over any other megas, because they're simply a cut above everything else. Mega Pidgeot isn't so good that I would never use Mega Blastoise, Mega Aero, or Mega Beedrill, and I wouldn't not use Feraligatr because I want to use Mega Pidgeot. It's good, but it's not so good that it invalidates usage of other pokemon- that's taking it a bit too far.