EX Emerald expansion is a bit different from other expansions. Many of the cards in EX Emerald work really well with cards from other expansions. Some of the cards in EX Emerald are re-released Trainer cards, so you can strengthen many of your current and new decks, and there are three new Trainer cards that can further improve your decks. Useful Special Energy cards, as well as collectible holographic basic Energy cards, are in EX Emerald as well. There are quite a few Stage 1 Pokémon-ex that are likely to be useful in a variety of situations.