I would firstly tell us if you play to play Smogon rules or are just battling on ORAS or X/Y on a 3DS, PlatinumDude is a very experienced player and his recommendations are some you should consider if you wish to play Smogon rules (also again even if you don't want to play smogon you've got some additional options to strengthen your team.
However, since i'm a big fan of letting folk battle how they choose i will give you some advice on better options for your team without the need for swapping any (that way you can use all your favorites).
OK lets start by breaking your team down through typing first:
Water
Fire/Ghost
Poison/Ghost
Electric
Dark
Normal
You've covered a wide variety of types here which can be useful, however lets look at your most common weakness
Fighting - 2 pokemon weak to it
you biggest threat to Blissey is a fighting pokemon, Blissey has god aweful defense and will be destroyed by a fighting pokemon, Zoroark may be able to take a hit or two before getting killed.
Lets look at your EV's next along side your Natures and moves:
Politoed - Calm increases Spec Def and lowers attack, you've put EV's into defense and HP, Now Politoed has a nice Special defense already so isn't going to be too troubled by many Special attackers. I'd recommend perhaps tying to get a Timid Politoed to take advantage of its Ok speed stat and put EV's into Speed and Special attack.
Politoed is a bit of an attack minded pokemon and judging from your moveset will mostly be attack based, so to cover the drop in defenses from giving it timid over calm, i'd recomend either giving Politoed an Assault vest OR if your solely about attack then perhaps give him either Sea incense, Wise specs, Choice Specs or Choice scarf (if you opt for sea incense i'd recommend having two water based moves and two other moves, this will take advantage of the Type boost, Drizzle boost and the 20% boost from sea incense, making Politoed pretty beastly). Wise specs will boost all of your special attacks by 1.1 without any penalty, while perhaps not as powerful as the other items, there's no downside and ALL attacks will be boosted which can help.
As for moves, you may wish to consider replacing Earthquake for Mud Shot (while not as powerful as earthquake, will make better use of politoeds stats and will also inflict a speed drop on your opponent which is useful against speedy electric pokemon). Scald is a great move to have as burning your opponent will half their attack meaning physical attackers will do much less damage. Ice beam is a good coverage move for Dragon, ground and Grass pokemon (one of which you are weak too), I'd perhaps replace Protect with either Hydro Pump or Focus Blast (Fighting moves are great coverage moves as there are MANY types weak to fighting).
So For moves: Scald, Ice beam, Hydro Pump (or Focus Blast) and Mud shot
As mentioned previously, i would recommend adding in a pokemon who could also benefit from drizzle (however i'm only going to give you better choices for each pokemon you've chosen, i'm not going to suggest replacements as i'm going to try and improve the team you've chosen)
Ok next up we have:
Chandelure: Modest is not a bad choice but again i'd recommend perhaps Timid nature as Chandelure has very high Special Attack anyway, we want to put that to good use by attacking first (or have a better chance of attacking first). The EV's are perfect, thats what i'd do!
now lets look at your movest:
Energy ball : great choice as this covers Ground, Rock and Water types weaknesses so you will be able to surprise them.
Shadow Ball: Combats your Ghost weakness and gets a damage boost as Chandelure is Ghost type
Fire Blast: I'd personally go with Flamethrower as although its less damage, its 100% accurate so there's no downside, also Flamethrower has lots more PP than Frie blast so over longer battles you'll be able to do more damage (plus still has 10% chance to burn just like Fire blast).
Will-o-wisp: I think this is a bit of a waste of a move slot as your chanderule runs Flame Body (33% chance to burn on contact) since the only pokemon going to hit you are physical attackers (as your weaker to them as your defense is lower than your special) this ability in itself kinda balances that out. I'd recommend using a recovery type move like Pain Split instead, this will mean if you use Life orb to boost damage, you will be able to recover some lost HP if you beat a pokemon or a pokemon with full HP swaps in (not only will it cause damage to them, but heal you too).
So move wise i'd go: Pain Split - Flamethrower - Shadow Ball - Energy Ball
Item wise i'd perhaps be tempted to say Life orb or Leftovers (life orb would be good with pain split)
Next up:
Jolteon: Timid is best to have on Jolteon, giving it Quick feet can be beneficial but i personally would go Volt Absorb (Just because you can switch into an electric attack that would hit Politoed, you'd get a better boost from it) Evs are in right place.
Moves:
Volt switch: I wouldn't change this
Shadowball: useful coverage move
Thunder wave: I wouldn't change this (you could replace this with Thunder if you plan on using Politoeds Drizzle)
Signal beam: I'd perhaps swap this for Hyper Voice, Its more powerful and has better coverage
Moves: Hyper voice - Shadowball - Volt switch - Thunderwave/Thunder
I'd give Jolteon Leftovers for HP recovery if you plan on volt switching a lot.
Now...
Gengar: Again wouldn't change nature or EV's at all.
Moves:
shadow ball - If your mega evolving then i'd replace with Hex
destiny bond - Usefull for Mega Gengar as shadow tag eliminates switching out. however if your not mega evolving i'd replce with Hex
psychic - I'd personally replace this with Toxic as you don't really need psychic for any coverage
dazzling gleam - Useful coverage for Dark type pokemon and to take out annoying Fighting pokemon that your other pokemon are weak to.
Toxic is a good status move to stop walls and stallers plus you can use Gengars speed to toxic first move then Hex second move for incredible damage!
Moves: Hex - Destinybond/Shadowball - Toxic - Dazzling gleam
Item: either Gengarite or Leftovers
and now....
Zoroark: I wouldn't alter its EV's or Nature both are great for Zoro (I'd recomend putting Chandelure as your last pokemon so Zoro diguises as it this will stop your opponent bringing in a fighting pokmon as chandelure is immune to fighting whereas zoro is weak, the opponent will likely bring out a Dark, Rock or water which Zoro is resistant to Dark and is neutral to water and rock)
Moves:
Dark pulse - Useful as chandelure can learn it too, so if diguised as chandelure, better for you as you'll get STAB damage (thus tricking your opponent more)
Grass knot - Replace it with Knock off (so we can start removing items from opponents and gives you more power than Grass knot and GK isn't that useful on Zoro)
Flame thrower - I'd perhaps swap this for Exosensory (as both Bug and Fighting are weak to Phychic)
U-turn - useful if you want to keep hidden or if you want to disguise yourself later if you are rumbled while in battle. Could replace Ariel ace for Fighting/bug coverage
Moves: Dark Pulse - Knock off - Exosensory -U-Turn/Ariel ace
Item: probably better off going Either Dread plate or Leftovers
And Finally....
Blissey: Wouldn't change anything on Nature and EV's, i'd probably replace Serene grace with Natural Cure (as Blissey doesn't learn many moves with additional effects that would make use of serene grace)
Moves:
Toxic - I'd keep this move (remember your Gengar has HEX, toxic as many pokemon as you can and if blissey dies use gengar to hex the opponent to death)
Flamethrower - i'd replace with Seismic toss (this is set damage which blissey needs as its got a lame movepool for attacks in my opinion, plus you are always going to hit 50HP damage or whatever level you are when you battle. this sometimes works out better if you play higher leveled battles.)
Soft-Boiled - Keep this for recovery, a must on Blissey
Grass Knot - Replace this with Healing bell (this cures all your pokemon of any status conditions, use Blissey as your healer)
Moves: Soft boiled - Healing Bell - Toxic - Seismic toss
hope this helps, this way your team is powered up and you don't have to swap anyone out.
If you want to try out your team then feel free to PM me your friend code, add me and i'll happily battle you with different teams to test your team out. :)
1. Politoed isn't really an offensive-minded Pokemon because its Special Attack is average at best, while it's somewhat slow. It has decent special bulk, though, which is why it's mainly played defensively, and this is so it has a better chance of sticking around so it can set up rain again when needed. Offensive sets could work, but it makes Politoed worn down faster; that variety is more frequently seen in VGC/doubles. Mud Bomb is useless on Politoed, as rain-boosted Scalds still outdamage 2x super effective Mud Bombs. Focus Blast also has redundant coverage with Mud Bomb too. Oh, and before you bring up Magnezone, while it's hit marginally harder by Mud Bomb, rain-boosted Hydro Pump still 2HKOes it:
252+ SpA Politoed Hydro Pump vs. 0 HP / 0 SpD Mega Manectric in Rain: 279-328 (99.2 - 116.7%) -- 93.8% chance to OHKO
252+ SpA Politoed Scald vs. 0 HP / 0 SpD Mega Manectric in Rain: 202-238 (71.8 - 84.6%) -- guaranteed 2HKO
252+ SpA Politoed Mud Bomb vs. 0 HP / 0 SpD Mega Manectric: 146-174 (51.9 - 61.9%) -- guaranteed 2HKO
If you really must use offensive Politoed, here's a much better way of doing it, but then again, unless the team is focused on abusing the rainy weather, it shouldn't be considered:
-Hydro Pump
-Ice Beam
-Focus Blast
-Psychic
Nature: Modest
EVs: 56 HP/252 SAtk/200 Spe
Item: Damp Rock
Ability: Drizzle
Psychic is there to let Politoed hit Mega Venusaur, who would normally wall Politoed otherwise. It also hits the occasional Toxicroak way harder than Mud Bomb would.
2. If Chandelure is to be used in standard play, Choiced sets are the best way to go, IMO, meaning that it won't really use Will-o-Wisp, as it's a bad move to get locked into:
-Shadow Ball
-Fire Blast
-Hidden Power (Fighting)/Energy Ball
-Trick/Energy Ball
Nature: Modest/Timid
EVs: 4 Def/252 SAtk/252 Spe
Item: Choice Specs/Choice Scarf
Ability: Flash Fire/Infiltrator
3. As I already mentioned, Jolteon is horribly outclassed by Mega Manectric and Raikou for the reasons I stated. If you
really must use it, Hyper Voice doesn't let Jolteon do anything noteworthy, and Hidden Power (Ice) is mandatory for letting it OHKO Gliscor and Landorus. Signal Beam lets it hit Celebi hard. Also, Substitute + Baton Pass is the best way to play it, IMO. Jolteon forces switches decently, and it can get a free Substitute. It can then Baton Pass it away to a teammate, who will then have the Substitute take the hit for them when needed. Unless you can really make use out of the below set, you're better off with the Electrics I mentioned:
-Substitute
-Baton Pass
-Thunderbolt
-Hidden Power (Ice)
Nature: Timid
EVs: 4 Def/252 SAtk/252 Spe
Item: Leftovers
Ability: Volt Absorb
4. Chandelure isn't a good disguise for Zoroark. Remember that while Illusion changes Zoroark's appearance until it gets hit by an attck, it won't change its type. Considering that Chandelure is weak to Stealth Rock while Zoroark is neutral to it, if the opponent sees "Chandelure" take less Stealth Rock damage than usual, they'll catch on that they'll be facing Zoroark instead, and will send in something that can deal with Zoroark itself, namely Fairies. Aerial Ace is borderline useless, as it doesn't let it hit Fighting Pokemon that hard, while Focus Blast running off of Zoroark's higher Special Attack hits them harder. Bug isn't weak to Psychic; it takes neutral damage from that type. Also, Zoroark also
needs a type that can take on Steels, namely Flamethrower and/or Focus Blast; replacing it was a bad option:
252 SpA Life Orb Zoroark Focus Blast vs. 0 HP / 0 SpD Infernape: 213-251 (72.6 - 85.6%) -- guaranteed 2HKO
0 Atk Life Orb Zoroark Aerial Ace vs. 0 HP / 0 Def Infernape: 156-185 (53.2 - 63.1%) -- guaranteed 2HKO
If you must use specially-based Zoroark, it's better with Choice Specs or Nasty Plot:
-Dark Pulse/Night Daze
-Flamethrower/Grass Knot
-Focus Blast
-Trick
Nature: Timid
EVs: 252 SAtk/4 SDef//252 Spe
Item: Choice Specs
or
-Nasty Plot
-Dark Pulse
-Focus Blast
-Flamethrower/Grass Knot
Nature: Timid
EVs: 252 SAtk/4 SDef/252 Spe
Item: Life Orb/Focus Sash
5. Refer to the above Gengar sets for much better alternatives. You're better off using one of Hex or Shadow Ball; don't try to combine both of the above sets at once. Gengar is also fine with using Ghost STABs alone, but if it must use a secondary attack, Sludge Wave/Sludge Bomb should be that option to let it hit Fairy Pokemon hard. If it must use a coverage attack, Focus Blast should be that attack, as Ghost + Fighting have perfect coverage together, with Sludge Bomb/Sludge Wave being Gengar's strongest attack. Psychic doesn't even let Gengar accomplish much; Shadow Ball and Sludge Bomb/Sludge Wave already hit them hard enough. Focus Blast hits Dark Pokemon harder than Dazzling Gleam would, while Dragons are already handled fine by Gengar's STABs.
