Colosseum Help!

Hey, I am having trouble beating Nascour/Evice in the end of Colosseum an i was wondering if it was my team/movesets

Either way, here's my team

1. Absol F


lvl. 50
HP:137
ATK:146
DEF:69
SP. ATK:85
SP. DEF:66
SPD:83

Shadow Ball
Swords Dance
Slash
Faint Attack

@No item

Quagsire M



lvl. 48
HP:167
ATK:92
DEF:108
SP. ATK:73
SP. DEF:74
SPD:49

Earthquake
Yawn
Sludge Bomb
Surf

@Quick Claw

Ampharos F



lvl.49
HP:169
ATK:92
DEF:81
SP. ATK:139
SP. Def:114
SPD:86

Thunderbolt
Attract
Light Screen
Thunder

@Macho Brace

Typhlosion F



lvl.49
HP:145
ATK:92
DEF:86
SP. ATK:120
SP. DEF:98
SPD:129

Swift
Smokescreen
Fire Blast
Flame Wheel

@Charcoal

Heracross F



lvl.49
HP:140
ATK:139
DEF:91
SP. ATK:45
SP. DEF:103
SPD:96

Reversal
Endure
Earthquake
Brick Break

@Nothing

Altaria F



lvl. 49
HP:149
ATK:89
DEF:108
SP. ATK: 100
SP. DEF: 100
SPD: 101

Dragon Dance
Sing
Dragon Breath
Fly

@nothing

I'm planning on using the masterball glitch on it :3
I'm also avoiding using the legendaries, i find them cheap to use, plus the fact i have my full team set as of right now