Please RMT

[Fort PokePower]

I've had my ups and downs with this team and I just can't decide if it's good or not. This is my 5th gen team:

Spoiler:

Female Volcarona
Rash Nature
Stats: HP- 244 Atk- 119 Def- 136 Sp. Atk- 266 Sp. Def- 164 Speed- 182
Ability: Flame Body
Moveset: Psychic, Protect, Heat Wave, Bug Buzz
Item: Twisted Spoon

Male Simisage
Docile nature
Stats: HP- 156 Atk- 119 Def- 84 Sp. Atk- 117 Sp. Def- 85 Speed- 129
Ability: Gluttony
Moveset: Crunch, Seed Bomb, Leech Seed, Focus Blast
Item: Big Root

Male Seismitoad
Relaxed Nature
Stats: HP- 268 Atk- 167 Def- 160 Sp. Atk- 162 Sp. Def- 136 Speed- 144
Ability: Swift Swim
Moveset: Sludge Bomb, Drain Punch, Hydro Pump, Surf
Item: Fist Plate

Male Gigalith
Calm Nature
Stats: HP- 207 Atk- 201 Def- 187 Sp. Atk- 105 Sp. Def- 112 Speed- 66
Ability: Sturdy
Moveset: Stone Edge, Earthquake, Rock Slide, Flash Cannon
Item: Quick Claw

Male Vanilluxe
Quirky Nature
Stats: HP- 186 Atk- 169 Def- 136 Sp. Atk- 168 Sp. Def- 146 Speed- 119
Ability: Ice Body
Moveset: Blizzard, Flash Cannon, Avalanche, Ice Beam
Item: Iron Plate

Male Hydreigon
Bold Nature
Stats: HP- 212 Atk- 154 Def- 144 Sp. Atk- 177 Sp. Def- 135 Speed- 156
Ability: Levitate
Moveset: Crunch, Flamethrower, Dragon Pulse, Earthquake
Item: Lum Berry

I already know I'm not going to use my Simisage, but I can't decide what to replace him with. I'm only putting 5th gen pokemon in this team. If you don't like my team, go ahead and say so but at least tell me what I can do to improve it.