Hi Collin here with my very strategy post
I'm sure I was the very first person ever to come up with this idea, because
back in December (Right after Neo 3 was released in Japan) when I read the
translation for the Neo 3 Blissey I immeadately saw this combo.
Blissey and Hyper Devo Spray

Translations

Blissey (From Neo 3)
120 Hp
Evolves from Chansey
Pokemon
When you play this card from your hand you may remove 4 damage counters from
this pokemon, and flip a coin if heads remove another 4 damage counters.
Retreat-CC
Weak-F
Resis-Psy

Hyper Devolution Spray (From Neo 2)

You may take the top evolution cards from one of your pokemon and return it
to your hand. (Not exact translation, but you should get the idea)

So after you do 80 damage with Chansey you evolve and take off either all 80
or just 40, if you only take off 40 than you can just use a Gold Berry.

Here's my most current deck with this combo

"Hard Boiled"

4 Chansey
3 Blissey
3 Scyther
2 Ditto

4 Oak
3 Elm
4 Computer Search
4 Item Finder
4 Hyper Devo Spray
4 Gold Berry
2 GOW
2 EcoGym
3 Energy Charge
2 NGR
4 Plus Power

4 DCE
4 Metal
4 Grass


Any questions or comments you can always e-mail me
Thanks for reading

Collin Turner
coturnerms@hotmail.com