I like the Gengar, as for Weavile. Modest is a bad idea. I'd go with Adamant or Jolly. But being as its speed is so damn high. Adamant mite be the better move.
As for a Move set for
Weavile - Adamant
Ice Shard - Priority STAB damage
Night Slash - STAB damage
I highly advise having those 2 moves.
As for the other 2 moves. Hmm.. Fake out could work. Aerial Ace to knock out those fighting types? It depends what you want. I just wanted to suggest those 2 moves.
I like the Adamant Tyranitar.
Moves, I like what you chose. But if you cant get Dragon Dance on it, then switch the Crunch for Payback. Payback's damage is doubled if you move last. There for making Payback = 100. Its got quite slow speed. So it may work out in your favor most of the time. If you CAN get dragon dance, then yes. Your move set is pretty good.
3nodding Just make sure you have no choice items equipped.
xd Reunclis, I'd say...the speed is horrible. Theres a VERY high chance you'll go last no matter what, unless trick room is in play. Maybe use a speed reducing nature? Quiet nature, boosts SPC ATK and lowers SPD. That should be better than a Bold nature, its defense isnt very impressive.
sweatdrop Just my opinion.
Good moves on it, maybe the 4th move could be Flashcannon? Energyball? Shadowball? Focus blast? Which ever you feel will help cover more types. Based on all the moves you have already.
As for Shuckle, instead of Bold, maybe go Impish nature. Boosts Defense and lowers SPC ATK. As for moves...
Toxic
Protect
Stealth rock - set this up 1st.
Smack down/stone edge
Thats just an idea, you can do it how ever you want to.
3nodding Ferrothorn, hmm. Sassy maybe? SPC Def boosting, while lowering SPD.
Would definitely help your Gyro ball out more.
3nodding You could make this your annoyance Pokemon.
equipped with leftovers.
moves could be
Ingrain
Leech seed
Spikes
Gyro ball
If you want to protect this Ferrothorn further, have someone on your team cast Rain dance, so that fire dmg is reduced to 2x instead of 4x on it.
3nodding Ferrothorn is quite popular now a days.
These are just my opinions, you dont have to do any of them. I'm just trying to give you an idea.
3nodding 
