The arguments against Jirachi NOT being S-Rank are simply absurd...
Firstly, Specs Keldeo. Seriously? A Keldeo locked in Hydro Pump is a nice invitation to Gastrodon or Jellicent, so Jirachi doesn't get 2HKOed: it can come back in later and paraflinch. Gastrodon with Storm Drain is quite deadly in rain, and with Keldeo having to switch out Gastrodon can attack with rain boosted Storm Drain Scald, which hits hard and can burn.
Secondly, Landorus-I. While this monster is a counter to Jirachi, Earth Power is easily predicted, allowing Jirachi to switch out for a mon like Rotom-W(common pairing on rain-teams) who threatens Landorus with Hydro Pump, forcing it to switch out.
Overall, Jirachi has excellent defenses, a good defensive typing and weaknesses that can easily be beaten with prediction(like Heatran for fire, etc).
S-Rank for Jirachi
Also, what do you guys feel about Scizor for S-Rank?. It's been top of the OU stats for a long time and is arguably the most viable mon out there with Technician Bullet Punch and Technician Pursuit making it one of the best mons in business.
If anything, these comments you made have hurt Jirachi's chances at S rank. You're basically saying that Landorus, Keldeo, and Heatran (all extremely common and excellent Pokémon) give Jirachi trouble
oh, but not if you have team support. Well no shit. Any Pokémon's counters can be dealt with if you have the proper teammates. Landorus-T doesn't counter Terrakion since you could
easily just switch into Rotom-W on Earthquake and KO with Hydro Pump. No, that just isn't how we should look at Pokémon and their rankings. I disagree with Jirachi for S rank. I think it's an extremely useful Pokémon, and during the Tornadus-T era, I might have agreed with it being S, but I just wouldn't put it on the same level as Landorus, Terrakion, Keldeo, and Politoed. It simply isn't as metagame-defining as any of these Pokémon. Versatile? Yes. Great wall? Yes. Pretty good sweeper with Sub CM? Of course. Great Scarfer? I think it's ok as a Scarfer, but only because I've never really found much use for him. I still admit that other players have, so I will concede that Jirachi
is a good Scarf Pokémon. But each of these sets have their problems. CM Jirachi
needs rain support, and if it doesn't have it, it can't make use of Thunder or get a boost from Water Pulse (though honestly, Flash Cannon and Psyshock are better IMO). If the stars align and Jirachi gets a few boosts, then it is indeed the most dangerous sweeper in OU, I think. But I think it's speed and lackluster special attack keep this set from putting it in S. The SDef set is the one I would say make it come close, but even then, it is beaten by the two most common special attackers in the tier, Landorus and Keldeo.
252 SpA Keldeo Hydro Pump vs. 252 HP / 236+ SpD Jirachi in rain: 214-253 (52.97 - 62.62%) -- guaranteed 2HKO after Stealth Rock
That's still just Scarf. Specs easily 2HKO's even outside of rain.
252 SpA Life Orb Sheer Force Landorus Earth Power vs. 252 HP / 236+ SpD Jirachi: 330-393 (81.68 - 97.27%) -- 18.75% chance to OHKO after Stealth Rock
Modest Landorus cleanly OHKO's, and all it takes is a little prior damage and Jirachi flat-out loses to Landorus.
Also, I feel like the SDef set needs rain support as well. That Fire weakness is just too much of a problem for Jirachi, and it really appreciates being able to take on things like Heatran, but it's somewhat reliance on rain is kind of a strike against it, in my opinion.
I want to make it clear that I don't think Jirach needs rain support, but rather that it appreciates it (to the point where rain makes it S rank, but A without it, IMO).
Like I said, I've never used the Scarf set to much success, but I know others have, so I won't comment on that. It just seems to me that Jirachi, while being a great wall, decent scarfer, and scary sweeper under the right conditions, isn't metagame defining enough for it to deserve S rank.
As for Scizor, I don't think we should even be discussing S rank for it. It's good, but not that good.