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Super Sponge

3 electabuzz
4 scyther
3 promo Mewtwo
1 Rockets Mewtwo
2 Mr.Mime 
2 ditto

Trainers
3 bill
2 Profesor Oak
4 Energy Removal
3 Super Energy removal
3 Gust of Wind 
3 Plus Power
2 scoop up
2 Computer Search

Energy
13 Psychic 
1 Grass
2 Double Collorless
6 Electric
The strategy of this deck is to get Mewtwos out in opening hand and scyther on the bench. Build mewtwo up and start building scyther. I have a lot of speed cards in this deck such as Oak and Bill to get all the good cards. I use Ditto and Mime for help against high hitters like Veenasaur, blastoise, and Charizard . Sometimes I get in to tight situations(like having one basic for a very long time) so I use my speed cards to get me a hard hitter like Rockets Mewtwo or Electabuzz. Hope yu can improve it. Thanx

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Overview
Well it's been awhile since I've done a Haymaker, and to be honest I don't really feel up to doing some complex overhaul... You've got the basics down, which usually isn't much of a problem with Haymakers. You could use some tweaking, though. Your Energy is kind of scattered a bit with the one Grass and two DCE. Trainers look like good choices but the numbers could be changed a bit, same with the Pokemon.

Pok閙on
Rocket's Mewtwo can be good, but it needs a lot of Energy to dish out good damage. One or two will do, but you don't want to go overboard with these. Mr. Mime's too situational and weak for Haymaker, though, take those out. I'd just drop a Scyther for another Electabuzz and take out the Mimes.

Trainers
You need a bit more card drawing, but other than that it looks okay. Let's add an Oak and a Com. Search. Your other choices are good, but I'd add a fourth Pluspower abd drop one ER for a fourth Oak.

Energy
Take out four Psychic and the Grass and add two Electric and two DCE. Here's the finished deck:
Pok閙on
4 Electabuzz
3 Scyther
3 Promo Mewtwo
1 Rocket's Mewtwo
2 Ditto

Trainers
3 bill
4 Professor Oak
4 Energy Removal
3 Super Energy removal
3 Gust of Wind 
4 Plus Power
2 scoop up
3 Computer Search

Energy
9 Psychic 
4 Double Collorless
8 Electric
I don't know how much Rocket's Mewtwo will help you, you could add another or take that one out as you see fit. Hope that helps, good luck!

~ Souper ~