Alakazam solo, the final question

Yes as long as you keep your Gengars alive as long as possible. I did a PC/FB Zam today with 11 seconds to spare. My team was
1. Gengar CP 2200 H/SB
2. Gengar CP 2150 H/SB
3. Gengar CP 1980 SP/SB
4. Houndoom CP 2240 S/FP
5. Ttar CP 3200 B/Cr
6. Ttar CP 3120 B/Cr

As you can see, my Gengars are terribly underpowered compared to yours. You should be fine

You should be able to easily roll over PC/FS with this team, with no dodging. PC/FB is trickier; if you dodge every FB, there is a good chance you will time out. Allow yourself time for a few tries in order to dial in the right amount of dodging.

Two Gengars is living dangerously against C/FS. Do you have a double dark Houndoom you can put in place of one of them? You might be able to do it as is, but I like your chances better with a Houndoom in there. As for which Gengar to replace, on paper, SC/SB looks better, but when I soloed C/FS, I was never able to get off two SB's from my SC/SB Gengar. When I swapped it out for a H/SB, the faster energy gain let me fire off two SB's, and I believe that was what put me over the top.

Against the FS movesets, try to dodge as little as possible.

I would say that team can take down any moveset with proper dodging. People have taken down C/FB using only level 30 mons and this team is pretty similar to what was used there. Against C movesets you want to move Mewtwo to the first spot. And be prepared for trial and error.