Pokemon TCG: Trainer's Toolkit - Rules of Play says:
You can turn your Pokémon Trading Card Game collection into playable, fun, and winning decks with the Pokémon TCG: Trainer's Toolkit. Inside this box, you'll find a plethora of cards that will expand and boost the strength of your deck—cards like the powerful Dedenne-GX, which has proven to be quite formidable in competitive play, as well as strategic Trainer cards and useful Energy cards. There's also a Deck Builder's Guide that will help you assemble a deck that showcases your best Pokémon.