From Bulbapedia, the community-driven Pokémon encyclopedia.
Blastoise's Super Soaker Deck is a type deck found in the Team Rocket Strategy Guide. The deck is classified as one of the advanced decks in the book, containing more rare cards than the easy-to-build decks.
Blastoise's Pokémon Power: Rain Dance can be a huge advantage early in the game. The problem is that Blastoise is a Stage 2 Pokémon. So you have to get Squirtle into play and then evolve it into Wartortle or play Pokémon Breeder to evolve Squirtle directly into Blastoise.
That's why this deck has ways to get Squirtle, Wartortle, Pokémon Breeder, and Blastoise from your deck to your hand. Pokémon Trader will let you swap a Pokémon in your hand for one in your deck. Sometimes the best card to get with Computer Search is Professor Oak. If you discard too many Pokémon and Energy Cards, use Nightly Garbage Run to shuffle them back into your deck.
Try to avoid using Blastoise as your Active Pokémon. Otherwise, he could get Knocked Out. Instead, use Poliwrath and use Blastoise's Pokémon Power: Rain Dance to attach a lot of Water Energy to it. Both Dark Vaporeon and Poliwrath also have attacks that discard Energy from the Defending Pokémon, making it that much harder for opponents to attack or even to retreat.