It was a dark and stormy night. Farfetch'd was just coming home from the company picnic, when.......

BAH!  FORGET THIS!!!!

I'll leave story time up to the mechanics that are good at it.  I fix decks. 

Hi! I just made a Wigglytuff deck but don't know if I did it right. I am
going to a very big tournament soon so I thought that you could make the
deck better so I could maybe win.
      Thanks!

4 Jigglypuff
3 Wigglytuff
3 Scyther
3 Fossil Magmar
3 Electabuzz

3 Gust of Wind
2 Scoop Up
3 Plus Power
3 Super Energy Removal
3 Professor Oak
2 Challenge!
1 Item Finder
2 Lass
1 Rocket's Sneak Attack
4 Bill
3 Computer Search

7 Electric Energy
6 Fire Energy
4 DCE

The strategy is to get out Wigglytuff early while powering up your
basics [Scyther, Electabuzz, Magmar] then beatdown on there Poke'mon.

Believe it or not, the first thing I will tell you is that you have too many Pokemon and too much Energy.  Not by much in either area, but a slight trim would help.

First off, let's trim your Pokemon count by 1 - drop a Scyther.

In energy, drop 2 Electric and 1 Fire Energy for 2 Rainbow Energy.  This clears a spot, and still gives some versatility to color, and even gives Scyther the chance to situationally Swords Dance.

Trainers are so key in Wigglytuff.  They need to have a specific goal, and be fast.  First of all, SER is not fast.  It's a great card, but not fast enough.  Drop it for ER, and use one of the 2 free slots for a 4th ER.  Let's also drop a Gust...it's a good card, but we need a slot.  Make one of the two slots an Item Finder, and the other a Rocket Sneak Attack. 

I am now going to say something that most people are going to disagree with, not going to like, and think is dumb.  Trust me, though - I have playtested this thing through the ROOF.....Challenge is bad.  Yes, Challenge is bad, especially in Wigglytuff.  Now, let me tell you why.  A good Wigglytuff deck, though Bill, Comp Search, and Oak will fill their bench without Challenge.  Most other decks do not have the same luxury.  If I am a player, playing against a Wigglytuff deck, I will accept every challenge made, and then go get my Hitmonchan, Chansey, and whatever else I have in my deck designed to take down a Wigglytuff.  You need the quick kill, and letting an opponent go get 3-4 basics from their library, put them on their bench, thus giving them 7-8 more turns to shut you down with a thinner, leaner library is bad.

Make the Challenges into Rocket Sneak Attacks.  Finally, make the 4th Bill into a 4th Oak.  This card is one of the most important cards in you deck, and you will need it. 

After playtesting some, you might find the need for Nightly Garbage Run.  Possibly drop a Sneak and an ER for 2, but playtest it first and see if you find them needed.

Final Deck:

4 Jigglypuff
3 Wigglytuff
2 Scyther
3 Electabuzz
3 Magmar

2 Gust of Wind
2 Scoop Up
3 Plus Power
4 Energy Removal
4 Professor Oak
3 Bill
2 Item Finder
2 Lass
4 Rocket Sneak Attack
3 Computer Search

5 Electric Energy
5 Fire Energy
4 DCE
2 Rainbow Energy

Have fun!

Scott