..
You're fucking kidding me.
Alakazam is the frailest pokemon ever. It has Snorunt Defence. Not even Spinda Defence but Snorunt Defence.
Do you have any idea how bad that makes it from the get-go?
Rankurusu is great because it not only has power but because it has bulk. Who gives a crap about Recover, even Calm Mind on Alakazam when it can't actually use either? On Rankurusu though, Recover is like Restalk without the sleep; Calm Mind is great on such a bulky sweeper.
You made a crappy point that started a shitstorm and you fail at defending said point. Even worse, despite the fact that numerous people cited its bulk as the main reason that it's different, you just kept on going..
Anyway let's end off the zam talk here; it's irrelevant and I'd like to get back to discussion of Rank:
On topic, where would HP Fire (to counter Scizor, apparently) fit into a moveset?
That's where the issues start: Rankurusu, in every incarnation, suffers from a really bad case of four-moveslot syndrome. Even worse than Dragonite. Let's suppose we use a few sets:
CM/Recover/Psycho Shock/Focus Blast or HP Fighting, preference.
That's for the CM set. What would you want to replace? Focus Blast being replaced means that Tyranitar eats you for breakfast. Lol if you replace Psycho Shock, as you're screwed in that case by not even making use of his best toys for the set. CM
could be removed, but you won't get enough power, and Recover is just too good to pass up. And on another note, if Scizor can get in without getting nailed on the switch, you still are going to get damaged badly, as there's no way in hell you're outspeeding Scizor unless it's paralyzed. Another set:
Trick Room/Shadow Ball/Focus Blast/Psychic or Psycho Shock
You could make an argument here to replace Shadow Ball, as outside of other Psychics you could use HP Fire to good effect, but then you'd need to rely on Focus Blast's painful accuracy. If Shadow Ball goes, Spiritomb and the Lati twins eat you for breakfast. That's nothing to say of other bulky Psychics, or even Metagross and Jirachi.
Overall, you could make a case for the Trick Room variant, but the CM set just doesn't have the room for it. Fighting gives much better coverage along Psychic. It's just too difficult to make room for it, so I'd personally use a lure to dispose of Scizor in any case. Tyranitar too, although Ranku can hold it's own against it. I've only shown some of the more "common" sets, although there are many others.
EDIT: iDunno, I doubt that. Even at the top of the ladder, I still had people swapping in Tyranitar on Rankurusu. I found it to where I just couldn't afford to give up HP Fighting (don't suggest to me to use Focus Blast, it's accuracy has caused so many crucial misses that cost me matches, I'd rather be able to KO most after a CM regardless with HP Fighting, which also helps for PP wars. The TR set needs FB though to deal with Tyranitar, there is no negotiating that.)