Hey /vp/ i need help making a badass competative Seviper...

ive tried to make a good one but no matter what... my seviper is taken down pretty fast

ive given it Razor Claw, Air Balloon, Black Sludge

dunno what to go with

the moves i use are

COIL
REST
POISON FANG
ASSURANCE

Apility: Shed skin(for rest)

ive also tired infiltrator... but cant make it work

Tips? What kind of Seviper do you have?