Gym leader clay..
 

I am having REAL trouble with Clay. I cannot beat him however hard I try.
This is my team:

Eevee lvl 24
Moveset
Sand-attack Covet
Quick Attack Bite

Growlithe lvl 25
Moveset
Flame Wheel Fire Gang
Strength Reversal

Servine lvl 26
Moveset
Leaf Tornado Mega drain
Vine Whip Wrap

Mandibuzz lvl 27
Moveset
Pluck Fly
Cut Faint Attack

Trapinch lvl 26
Moveset
Rock Tomb Dig
Rock Slide Bulldose

Ducklett lvl 26
Moveset
Aerial Ace BubbleBeam
FeatherDance Aqua Ring

Any help or tips would be nice. Bye! ;3