Singles: XY: Base Set

The XY Base Set, also known as the Pokémon XY expansion, is a core set from the Pokémon Trading Card Game released in 2014. It marks the beginning of the XY Series within the TCG and introduces various Pokémon, Trainers, and gameplay mechanics that coincide with the Pokémon X and Y video games.

Here are some key features of the XY Base Set:

1. New Pokémon: The set introduces Pokémon from the Kalos region, including the starters Chespin, Fennekin, and Froakie, as well as iconic Pokémon like Pikachu, Charizard, and Mewtwo.

2. Mega Evolution: One of the significant introductions in the XY Base Set is the concept of Mega Evolution. This gameplay mechanic allows certain Pokémon to undergo a temporary transformation into a more powerful form during battles. Pokémon like Mega Venusaur, Mega Charizard, and Mega Blastoise make their debut in this set.

3. Trainer Cards: The XY Base Set includes various Trainer cards that offer support and strategy to players during battles. These include items like Professor's Letter, Roller Skates, and Tierno, which help players draw cards, retrieve energy, or search for specific cards in their deck.

4. Energy Cards: The set includes Basic Energy cards necessary for powering Pokémon attacks and abilities. These energy types include Grass, Fire, Water, Lightning, Psychic, Fighting, Darkness, Metal, Fairy, and Colorless.

5. Card Rarity: Pokémon TCG cards are categorized by rarity, with Common, Uncommon, Rare, and Ultra Rare being the primary classifications. The XY Base Set features various rarities, with Ultra Rare cards being sought after by collectors and players for their rarity and powerful effects.

6. Theme Decks and Booster Packs: The XY Base Set is available in both theme decks and booster packs. Theme decks provide players with pre-constructed decks designed for immediate play, while booster packs contain random assortments of cards, encouraging players to collect and trade to build their decks.

Overall, the XY Base Set serves as a foundational release for the Pokémon TCG's XY Series, incorporating new Pokémon, mechanics, and strategies inspired by the Pokémon X and Y video games.