[How do I beat Shelley?]

I'm struggling with Shelley; my entire team's at Level 35, and I've only gotten her down to "Bugsy" once. 

 

Galvantula @Unnerve 

-Sticky Web 

-Signal Beam 

-Electro Ball

-Cut 

 

Loudred @Scrappy

-Uproar

-Stomp

-Roar

-Bite 

 

Pyroar @Unnerve 

-Echoed Voice 

-Fire Fang 

-Endeavor

-Work Up 

 

Noctowl @Insomnia

-Zen Headbutt

-Extrasensory

-Air Slash 

-Reflect 

 

Swampert @Damp

-Water Gun

-Rock Slide

-Mud Shot 

-Protect 

 

Swalot @Gluttony

-Acid Spray 

-Body Slam 

-Stockpile 

-Toxic 

 

 

I need advice on a strategy or any Pokemon you think I should replace.