Lately, I have been using 2 wigglytuff in my deck, and I have come to believe that wigglytuff is perhaps one of the most powerful cards in the game.
 
For one thing...
 
Wigglytuff has a powerful pre-evolution, jiggly puff
 
JigglyPuff                60 Hp
C    Lullaby
    The defending pokemon
    is now asleep.
CC    Pound            20
 
Weakness:Fighting
Resistance:Psychic
Retreat:C
 
Ok, now jiggly is obviously a strong basic.  He can do either attack on turn one (if you get a double colorless), and he has high hp (even though he's not in the popular group with scyther and hitmonchan).  Jigglypuff has the common weakness/resistance of colorless, and low retreat cost.  He, actually is not a bad basic.  But the great thing about this evolution is that they have step-up attacks.
 
Wigglytuff                80
C    Lullaby           
    The defending pokemon
    is now asleep
 
CC    Do the Wave                10+
 C     For each pokemon on
        your bench, this attack does
        10 more damage.
 
Now, eighty hp is pretty high.  And being colorless he goes in any deck.  And although he does need basics to do damage, what deck doesn't use basics?  He is awesome.  Jigglypuff can do either attack on the first turn, and then add 1 (or two) energy and evolve.  I play wiggly, and you will find that he is one hard guy to take out.  He also has the advantage of only being a stage one.  You should definitely try out this evolution.  He can take numerous hits from some of the most popular cards, works well with super potion, plus power, and Challenge!.  There are many trainers that compliment him, and would work well with him.  Any trainer that get's you basics will work.  Also, wigglytuff works in any speed deck.  Because he is colorless, one DCE and an energy will pump him up, and he can do good damage.  But other heavy hitters like machamp, Nidoking, and Pinsir have fallen out of tournament play because they need specific energy (usually 4, and 3 of them are elemental).  I am sure that if you play wigglytuff you will fall in love with him.
 
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NotRT_Tuba@yahoo.com
 
By the way, NotRT stands for Nights of the Round Table.  It is a new apprentice clan.  E-mail me if you are interested in joining.