Black 2 Team Help?

[pokeproblems]

I am up to the Elite Four, and I constantly beat all of them, except for Shauntal, the Ghost type one, and her stupid Chadalure who uses Flare Blitz or something on me every time. So I went back and trained, caught more Pokemon, filled up my Pokedex, changed my team up, and tried again. My Serperior was the only one left. I had boosted up my Serperior's Defence, and Chandalure used Flare Blitz, I was left with only one HP. I used my strongest move: Frenzy Plant. It did a decent amount of damage, but of course, I ended up losing anyway. (I'm not planning on changing anyone, I want to make them stronger, somehow)

Here's my team:

Serperior Level 70 (Boy)
Moves:
Leaf Blade
Leaf Storm
Giga Drain
Frenzy Plant

Abilty: Overgrow
Nature: Docile

Stats:
Attack: 159
Defense: 159
Sp. Atk: 139
Sp. Def: 156
Speed: 195

Altaria Level: 52 (Girl)

Moves:
Dragon Dance
Dragon Breath
Attract
Dragon Pulse

Ability: Natural Cure
Nature: Adamant

Stats:
Attack: 105
Defense: 107
Sp. Atk: 72
Sp. Def: 122
Speed: 99


Volcarona Level 52 (Girl)

Moves:
Silver Wind
Toxic
Psychic
Fire Spin

Ability: Flame Body
Nature: Adamant

Stats:
Attack: 86
Defense: 90
Sp. Atk: 145
Sp. Defense: 124
Speed: 123

Unfezant Level 54 (Boy)

Moves:
Air Cutter
Fly
Detect
Air Slash

Ability: Big Pecks
Nature: Quirky

Stats:
Attack: 141
Defense: 102
Sp. Atk: 93
Sp. Def: 74
Speed: 123

Swanna Level 49 (Boy)

Moves:
Brave Bird
Scald
Surf
Ice Beam

Ability: Keen Eye
Nature: Gentle

Stats:
Attack: 115
Defense: 63
Sp. Atk: 95
Sp. Def: 79
Speed: 106
Absol Level 46 (Boy)

Moves:
Cut
Ice Beam
Blizzard
Future Sight

Ability: Super Luck
Nature: Serious

Stats:
Attack: 142
Defense: 73
Sp. Atk: 86
Sp. Def: 67
Speed: 81

 

[faucin]

Serperior:Give your serperior a diverse moveset, having only grass moves makes you easy to wall. you can teach him aqua tail (move tutor in lentimas town, requires 8 blue shards) to counter the chandelure. also teach him coil at the PWT relearner.
Altaria: you can change a little his moves too, so he has more coverage, check your TMs for moves that could work for it.
Volcarona: you should replace fire spin with flamethrower (if i remember correctly you find the TM in the route after the giant chasm) and level him to 59 (i think) so it learns quiver dance, and with a move tutor in humilau city also teach him giga drain for coverage if you want
Unfezant: you can teach him roost with move tutors, so it has some recovery.
Absol: his attack stat is great, but it moveset is very special oriented, i would replace ice beam, blizzard and future sight (and also cut) with sucker punch,night slash, swords dance, psycho cut (learns it at level 49) the rest can be teached by the move relearner at the PWT if you have heart scales. Note that dark type is super effective against ghost, so you can defeat chandelure with sucker punch easily

one more thing, see what items you could give to your mons to help them, they always come in handy

i hope it helps

 

[pikastar]

if chandalure is your problem, try krookodile. its a dark/ground type, both are super effective considering chandalure can't have levitate

 

[pikastar]

Also, how can chandalure be a problem if your using absol, it uses dark type moves