This is located to the right of the city entrance in the Southern Boulevard, right before you reach the blacked out part of the city (first visit). They offer a Double Battle meal which will pit you into three Double Battles in a row. You also have to win each battle within the number of turns they specify. This battle costs p3000.
Chef Roger
Must be defeated in two turns
This is similar to the South Boulevard Restaurant, Restaurant Le Nah. It is located in the Autumnal Avenue, accessible only after restoring power to the city's northern part. This establishment offers a Triple Battle and Rotation Battle Meal, each costs p15,000.
(Triple Battle)
Waitress Talia (Prize Money: p1,984)
Triple Battle: Defeat in 3 turns
Rotation Battle: Defeat in 6 turns
Garcon Georges (Prize Money: p1,984)
Triple Battle: Defeat in 4 turns
Rotation Battle: Defeat in 6 turns
These trio can use Dig, Fly and Earthquake respectively.
Owner Yannick (Prize Money: p4,960)
Triple Battle: Defeat in 3 turns
Rotation Battle: Defeat in 6 turns
Chef Albern (Prize Money: p1,984)
Triple Battle: Defeat in 3 turns
Rotation Battle: Defeat in 6 turns
After completing the course meal without going over the required number of turns and without any pokemon fainting, you'll receive Big Mushrooms as reward. The number of mushrooms may vary on your performance.
At Le Yeah restaurant there is a back exit with stairs that are blocked off and doors that wont open. Is this somewhere you get into later in the game?