Hmmmm.... I might do a few for you, but I can't promise good results as this is my first time.
Gengar, Leftovers held
Hypnosis
Dream Eater
Focus Blast
Shadow Ball
Reason why: Hypnosis/Dream Eater combo has always been a friend to me. It can get rid of those pesky physical attackers that use Grass/Water/Fire and types that Gengar are weak to. While they're sleeping, throw a Dream Eater in and chip away at them with Focus Blast (Great for getting rid of Normals and others, if a little shoddy in accuracy and no stab. Being Special makes up for part of it) and/or Shadow Ball (Stab, special, 80 power, this is great for getting rid of other ghosts and whatnot.)
Zangoose, Focus Sash held
Swords Dance
Return
Double Team
Fire Punch
Reason why: Zangoose is quite frail, as it has base 60 defence and special defence. So straight away, Double Team. Keep doing this untill the opposition start missing constantly (Maybe three times is good). Now use Swords Dance a few times and let rip with either Return (Maximum Happiness plus STAB plus Base 115 attack = One damn strong move) or Fire Punch (For ghosts, grass, steel and bug. Also covers some other types.) for the win. A little risky, but should go well with the Gengar above.
Shuckle, Chesto Berry held
Substistute
Toxic
Gyro Ball
Rest
Reasons why: Ah, Shuckle. Such a useless thing, yet at the same time the best Pokemon. Make use of its uber defence and spec. defence stats by Subististuting, Toxic (Great indirect move for awful attackers) and Gyro Balling (Makes use of its pitiful speed, by making it very powerful.) Use Rest once HP gets low, but make sure you have a Chesto berry equipped (Not Lum, as this could be used up before you get a chance to use Rest)
So there. Sorry about the movesets, they are mostly based off of TMs and Move Tutor moves, but I did good, right?