Lets take a good look at promo eevee

Eevee   HP 30?

Pokemon Power: Chain Reaction
Use this power only when another pokemon evolves. Search your deack for a
card card called Jolteon, Dark Jolteon, Flareon, Dark Flareon, Vaporeon, or
Dark Vaporeon, and add it to your hand. Shuffle your deck afterwards. This
power cannot be used if Eevee is paralyzed, confused, or asleep.

(C)           Bite               20

Weakness: fighting    Resistance: Psychoc  Retreat: Unknown at the time

This card would do soooooooo good in a raindance deck.

The perfect hand would be:
Squirtle
Blastiose
Pokemon Breeder
Eevee x2 (beginning active)
Water Energy
Professor Oak

Turn one. Put out Squirte and Eevee on bench. Water energy on Eevee. Attack
for 20.
Turn two. Poke. Breeder to Blastiose. Use both Eevee's power. Search for 2
vaporeons. Oak for a fresh hand. Start kicking butt.

Ok here's my deck list...
4x Squirtle
3x Blastiose
1x Dark Blastiose
4x Promo Eevee
3x Vaporeon
4x Articuno

4x Pokemon Trader
4x Pokemon Breeder
3x Bill
4x Professor Oak
2x Defender

24x Water Energy