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Aaron's Step 3 Deck (Japanese: あらいモンステップ3デッキ) is a deck made by one of Dr. Mason's researchers, Aaron, in Pokémon Card GB2: Here Comes Team GR!. The main purpose of this deck is to tutor the player on how to deal with Pokémon Powers, such as Damage Swap. It focuses on primarily types, the secondary focus being and .
This deck is the last of the Step decks.
Practice Deck #3
Just like Aaron's Step 1 Deck and Aaron's Step 2 Deck, the player is not permitted to use his or her own deck; instead, the player is given a deck by Aaron to combat Aaron's Step 3 Deck. Like the first two practice decks given by Aaron, this deck also has no official name, so it will be referred to as Practice Deck #3 (Japanese: 練習デッキ＃ 3). The majority of the focus is on Pokémon, and the fixed deck order allows for them to be fully evolved and full of energy early in the game if played optimally while Aaron moves any damage taken to the bench.
After completing the match (win or lose), the deck cannot be kept.