If you're not really sure as to what your deck could be, then fret not. In Dr. Mason's laboratory, there is a special machine that exists. This machine is known as the Auto Deck Machine and, if you have the cards for the specific decks, will automatically create them for you and save the combination.
However, there is a limit. Each of these decks is relegated into a specific category based upon its type. These categories are accessed on specific machines and you can save up to 60 total. In addition, by these machines, you'll find Aaron who will challenge you and give you a Laboratory booster.
In addition to that, there's an extra machine in the Hall of Honor which is unlocked after you have defeated the Grand Masters.
Finally, many of the decks used here are ones that have been used by various members in the clubs across TCG Island.