Pokémon Trading Card Game/Pokémon Dome

This is the home of the Grand Masters. The four best Pokémon duelists in the world, each using a deck with copies of their signature Legendary Card. The very same Legendary Cards your journey in this game has as its goal.

You can enter the Dome at any point in the game. There are some bookcases that you can read to get information on each of the Legendary Cards, the Grand Masters themselves, and the Master medals. However, without all eight medals the doors to the main hall will not open.

Grand Masters
Once you have all 8 medals and enter the main hall, you'll find yourself in an Elite Four situation. You will face each of the Grand Masters in a row, your only reprieve is between each match where you can adjust your deck and save. You won't be able to leave unless you beat them all, or lose to one of them.

Champion: Ronald
After defeating the Grand Masters for the first time you will have one more opponent to face. Ronald has already beaten the Grand Masters, obtained the Legendary Cards, and has been named Champion. You must defeat him to take his place.

His deck contains at least one copy of each of the Legendary Cards that you faced in each of the Grand Master battles.

After defeating Ronald you will be taken to the Hall of Honor and given a copy each of the Legendary Cards. You also won't have to face Ronald again if you decide to come back to the dome after the credits to get more copies of the Legendary Cards.