Seven Island, Sevault Canyon Tanoby Ruins

Seven Island is the last of the Sevii Islands. There are two places to visit: the Trainer Tower and the Tanoby Ruins. Once you get to the island, go north to check out the Trainer Tower. Here, you must go through eight levels of trainers to reach the top and claim your prize. Battling the trainers here will neither give you experience nor money. These battles are timed, so try to do your best. The level of the Pokemon here will match the level of your highest level Pokemon.

Locations (Seven Island)
Cubone Fearow Gyarados Horsea Larvitar Mantine Marowak Meowth Onix Persian Phanpy Psyduck Seadra Sentret Skarmory Slowpoke Spearow Tentacool Tentacruel

After having some fun in the Trainer Tower, fly or walk past Seven Island's Pokemon Center, and start going south. Once you reach the bridge, talk to the guy with the blue hair. He's a Move Tutor, and will teach Swords Dance. Keep on going south, and you'll soon reach Sevault Canyon.

Sevault Canyon, Tanoby Ruins

Just follow the road and you'll know where to go. First, you'll battle two Cooltrainers. Go down the stairs to their left, and enter the cave called the Tanoby Key. Here, you'll solve a puzzle, shown in the screenshot to your left. As you can see, there are a total of seven rocks, three on top and four on bottom. Using strength, push the top middle boulder all the way up onto the hole. Next, push the other two boulders to the corresponding upper left and right holes. Then push the bottom row of the bottom boulders to their corresponding holes, and do the same with the last two. After all the boulders are in their place, there will be an earthquake. Now Unown will be available to catch in the Tanoby Ruins in the South.

Leave the cave and continue to go south. Along the way, there's an Itemball surrounded by rocks and boulders. That turns out to be a King's Rock. After that, you'll find a small house. Inside, talk to the man so you can dance the "Chansey Dance" to heal your Pokemon. The item on the table is Lucky Punch. Go south a bit afterwards, surf, and you'll reach the section of Seven Island known as the Tanoby Ruins.

The Tanoby Ruins are composed of seven mini-islands each containing a few different types of Unown. There's even two new Unown (! and ?), making the total number of Unown twenty-eight