Seel and Dewgong. Very overlooked cards. 

Okay, so seel can only do 10 damage, 
but think, it has 60 hp, that's as many hp as Mewtwo or Magneton. So what if it only does 
10 damage, it's got quite a bit of hp for a basic pokemon. When you avolve it 
into Dewgong, that's even better. Many people think of Dewgong as another junky 
card. WAKE UP!!!!!!!!!!!!  Aurora beam does 50 damage, Ice beam does thirty 
and has a 50% chance of paralyzing. It's just about as good as a frickin' 
Gyarados or Blastoise, it's just 20 hp short of both of 'em. Another thing- 
Dewgong is more common than Blastoise and Gyarados. 

My deck is on the Killer Decks page, I have 2 Dewgongs. They always stay active fof 
me for at least 3 turns. A Dewgong could take a Charizard out in two hits, with 
2 Plus Powers it could take him out in one hit. Dewgong and Seel-two more 
overlooked cards.