Well, Sneasel is good against Lucian's Psychic PKMN. When you get to his Bronzong, it gets tricky because it has the ability Levitate so you'll need a Fire PKMN for that or teach one of your mains a fire-type TM. I suggest training you PKMN a bit more by going through the Elite Four over and over or go into the Victory Road.
well i use my haunter cause of night shade(4 bronzoing) and darkpulse (others) ang giga drain (ground type leader)
if im dying i use curse
btw heres empolion
Hydro pump 5pp
Hyper beam 5pp
Blizzard 5pp
Flash cannon 10 pp
garchomp
Strangth 15pp
Draco meteor 5pp
dragon rush 10 pp
dig 10pp(awsome for killing ground types)
Luxray
strangth
flash
thunder fang
thunder
Sneasle( i need the item to evolve anybody know were to get one?)
blizzard
cut
darkpulse
focus punch
Staraptor
brave bird
fly
close combat
defog
thats all foks
Pokemon platinum
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Your Empoleon seems alright. Mine knows Hydro Pump, Hydro Cannon, Drill Peck and Earthquake.
Your Garchomp looks alright as well but teaching it Earthquake would be better than Dig for sure.
If you can manage to get Luxray to Lv. 56, it will learn Discharge which is a good Electric attack for it. I suggest getting rid of Flash on it for something like Iron Tail (TM), Hyper Beam (TM), or even Giga Impact (TM).
Your Sneasel needs a Razor Claw to evolve into Weavile but you have to level it up at nighttime though. I guess when evolved, you could teach it Shadow Ball (TM), Shadow Claw (TM), or Avalanche (TM) by getting rid of Cut. If you don't have a Razor Claw, then you can find one at Route 224, Victory Road, or Battle Park.
Your Staraptor shouldn't have 2 HM Moves because it prevents you from teaching it good attacks. Get rid of Defog and you could teach it Roost (TM) the healing move for Flying PKMN, Steel Wing (TM), or even Aerial Ace (TM).
Your Haunter knows Night Shade, Dark Pulse, Giga Drain, Curse. You might want to give up Night Shade for something a little strong like Shadow Ball (TM) or Shadow Punch (TM). I would give another suggestion but Dark Pulse seems alright with it but seeing how Sneasel has it, Haunter is always good for backup. Giga Drain I guess is alright. If your Haunter was more of the put to sleep dream-eating !@#$%, then I'd say something.
If you need Gengar, just ask and I'll do a quick trade-tradeback with you. Other than that, your party seems alright to me, you just need to work on them a bit more and teach some stronger and better moves, that's all.