After you get the secret rank, you can as an option go to seven new dungeons which unlock seven legendarys which unlock The Seven Treasures. Or you could just skip this and go to the next part of the story, which is Sky peak and the Shaymin Village.
it isn't possible. You can only get to the Lucario rank.
in mystery jungle after you get secret rank
After get the secret rank, go to the guild and you will receive the missions for 7 different dungeons. Accept them to unlock these dungeon. After you finish the missions, Mr. Mine will appear next to the Kecleon Shop.
you don't need it just have level 100 Pokemon qnd keep going the higer your explorer rank the more likelyhood of new dungeons ok my rank is diamond rank but im stuck in blizzard cave
secret rank you get this by beating frosslass and save scizor
first you have to get the secret rank to do it and it will tell you from there
if you have attained master rank, then use wonder mail to unlock new dungeons and dothe seekers of the seven treasuresl like me.
basically its master rank because those new dungeons are not in time or darkness therefore you cannot have guild-master master *** master ** or Master * ranks master is the highest you can have
normal rankbronze ranksilver rankgold rankdiamond rankhyper rankmaster * rankmaster ** rankmaster *** rankguildmaster rank(after you rescue scizor from froslass he gives you the secret rank)
After graduating from the guild, talk to Mr. Mime (sometime, maybe not straight away) and he will tell you about blizzard island. Get through, beat Froslass, and rescue Scizor. He will give you the Secret rank.
The Secret Rank is obtained by first speaking to Mr. Mime in Treasure Town. He will mention the legendary explorer Scizor and tell you that he was last seen exploring Blizzard Island, and then show you where it is on your map. If you complete this dungeon, a second will appear, called Crevice Cave. If you defeat the boss, Frosslass, Scizor will grant you the Secret Rank upon returning. The Secret Rank is used to take the special Wondermail search missions. There are seven. Each will unlock a secret dungeon that is home to a legendary Pokemon who holds a certain item that boosts recruitment rate for a Pokemon type.
you have to get the mystery jungle mission (hint: you have to rescue scisor and he will give you secret rank. to do that you have to beat dialga and go to blizzard island. Mew is the boss of Mystery Jungle.