A theme deck, previously known as a preconstructed theme deck, is a playing deck of Pokémon Trading Card Game cards sold pre-packaged alongside mainstream card sets. Most theme decks are designed with a specific strategy (such as Special Conditions) or theme (such as Starter Pokémon) in mind.

Theme decks are mostly seen only alongside English-language releases and are seldom released in Japan, released only alongside debut sets such as Base Set and Neo 1, as well as alongside the original Gym sets. The vast majority of Japanese decks released are half decks and are released alongside almost all sets.

For English-language set releases, most expansions are assigned two theme decks affiliated with the set, with the next most common number being four theme decks for releases such as Base Set, Base Set 2 and the two Gym sets. Only three sets have included three theme decks so far (EX Crystal Guardians, Diamond & Pearl and Great Encounters), and the only mainstream set to include no theme decks is Neo Revelation.

English Expansion Theme Decks

Base Set

Jungle

Fossil

Base Set 2

Team Rocket

Gym Heroes

Gym Challenge

Neo Genesis

Neo Discovery

Neo Destiny

Legendary Collection

Expedition Base Set

Aquapolis

Skyridge

EX Ruby & Sapphire

EX Sandstorm

EX Dragon

EX Team Magma vs Team Aqua

EX Hidden Legends

EX FireRed & LeafGreen

EX Team Rocket Returns

EX Deoxys

EX Emerald

EX Unseen Forces

EX Delta Species

EX Legend Maker

EX Holon Phantoms

EX Crystal Guardians

EX Dragon Frontiers

EX Power Keepers

Diamond & Pearl

Mysterious Treasures

Secret Wonders

Great Encounters

Majestic Dawn

Legends Awakened

Stormfront

Special Theme Decks

EX Master Trainer Decks

EX Epic Collection

2004 World Championships

2005 World Championships

2006 World Championships

2007 World Championships

Japanese Theme Decks

Base Set

Gym 1

Gym 2

Neo 1

e-Card 1

Pokémon Card Game DP

Japanese Deck Kits