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Hi Crash!
Well,this is my 1st time writing a deck to be fixed. It's a poison deck with a new Koga twist.Try to stick to the theme,ok?
Well,here's the deck!
POISONOUS PERIL POKEMON 
3xOddish(TR) 2xDark
Gloom 3xKoga's Weedle 2xKoga's Kakuna 1xKoga's Beedrill 
3xKoffing(2
base,1 TR) 2xDark Wheezing 3xEkans(TR) 2xDark Arbok 
TRAINERS 1xErika
1xKoga 2xPluspower 3xSwitch 3xPotion 1xCPU Search 1xFuschia 
City Gym
1xChallenge! 1xItem Finder ENERGY 21xGrass Energy 
STRATEGY Get a poison pokemon out and poison like crazy. If needed,use Koga. Heavy Hitter(s):Koga's Beedrill,Dark Arbok,and Dark Wheezing.

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Overview

Check out Crash's fix of this deck at Crash's Shrink Tank.

This'll have to be another quick one... Poison is always nice, but you have a few too many families and too few BBPs to back them up. Trainers need some focus, too, and you could use a few more.

Pok閙on

Like I said before, you have a few too many families. Dark Arbok's attack is too expensive for a stage one with low HP, and Dark Weezing's attack is too conditional in that it's hard to get a benchful of koffings and ways to clear damage off them without changing the focus of the deck to Weezing. Take out those two families and add three Scyther and two Ditto. Make the Beedrill family 4/3/3 and you're good to go.

Trainers

You need more multiples and card drawing here. Take out Erika, Koga, Switch, Potion, and Challenge; there are better options that work similarly. In their place, add four Bill, three Oak, two more Com. Search, another Item Finder, three Scoop Up, two more Fuschia, two more PlusPower, and two GOW.

Energy

Too much, take out eight Grass and add three Double Colorless and three Full Heal.
Pok閙on (20)
3 Oddish(TR) 
2 Dark Gloom 
4 Koga's Weedle 
3 Koga's Kakuna 
3 Koga's Beedrill 
3 Scyther
2 Ditto
 
Trainers (21)
4 Pluspower 
2 GOW
4 Bill
3 Oak
3 Com. Search 
3 Fuschia City Gym
2 Item Finder 

Energy (19) 
13 Grass Energy 
3 DCE
3 Full Heal
Hopefully that'll help you out. Just be careful with Gloom's Pokepower. Beedrill and Scyther's free retreat should help you as well as Full Heal Energy, Scoop Up, and Fuschia Gym. Good luck!

~ Souper ~