Alright, while a few others are working onsome things, i'll get my idea out of the way.
Legendary Spot Proposal
I couldnt think of something better to label this.
As a followup from my guy in the department store, there will be a section of the mountain blocked by buntch of rubble (clearable via rock smash) that leads to an exit. Going through this will take you outside the mountain on a path that is able to connect to some other mountain peaks (three) via bridges, which each have a pillar on them. A blind monk stands at the crossroads of the three bridges, and looks you over.
"So thats where that fool took my instructions... Well, at least you look capable. Visit the pillars in clockwise form, read the map each time you enter, and you will find what you seek."
Okay so each tower is different bit. First one is labeled the Wind Pillar. In it, you open your map to see brail with it reading here "Right, Up, Down, Up, Fly" with just using fly causes the atmosphere to change a bit. A mighty gust picks up, and columns of win start appearing, with you needing to take the right one all the way up to get to the top where you see that the winds started to help fortell the coming of Tornadus (which is now catchable).
After deciding to head back to the crossroads for the next pillar, you see the monk gone, and an item there in his place. Here will be the Reveal Glasses. You take them and travel to the next one, the Storm Pillar. The map reads here, "Left, Up, Right, Down, Right, Flash". A thunderclap happens and lightning and rain begins to ensue all around. Every bolt hits the ground below, causing some machines to buzz alive, making stairs for you to ascend to battle Thundurus above as he arrives.
Aftr coming back, you see a sign now there, with it saying you can re-stock the legends (all of em really) by turning game off and back on (whatever that means). You head to next one, the Earth Pillar, and the map reads "Up, Up, Up, Right, Down, Right, Strength". Doing so will cause the ground to quake, causing pillars to ris up and down, before allowing the whole floor to raise up so you can get to the top and reach Landorus.
After coming back to the crossroads, you see nothing and return the mountain you came from.
Anyway theres that one. Thought it be fine with a cool brail nod and all.