I have a really weird theory, mainly because the Ruins are near the Abundant Shrine where you can obtain
Landorus.
I believe that Landorus submerged the now-ruins because the civilization that lived there, which I call Kyosia, were stealing crops from the former village I call Laniopa. Over the course of 500 years, Laniopa became half the village it used to be. Laniopa's ruler, who was Landorus's trainer, comanded Landorus to destroy the city that destroyed theirs.
There, at this time, was no ocean near Kyosia, so after Landorus lowered the city down, he called for
Tornadus and
Thundurus, whom he had sealed away, and made a deal with them. If they made a storm large enough to cover Kyosia with water, Landorus would allow them to roam free again. They agreed, and slowly covered the former thriving city with rainwater.
Forseeing what was to come, Kyosia's king, (whom was
Kyurem's master), told
Kyurem to fly the townspeople away 3 at a time before the city became completely submerged. After 10 trips, the storm was too great for Kyurem to fly through. The remaining 40 townspeople knew they wouldn't survive, and used their last breaths to carve odd symbols onto the walls in honor of the man who attempted and somewhat succeded to save Kyosia.
Kyurem led the 30 survivors to Lacunosa Town. Since Kyurem was still weak from saving those people's lives, it went into a great slumber inside the Great Chasm, where it was eventually forgotten and turned into folklore.
But as for Laniopa, Thundurus and Tornadus returned to the town to exact revenge on Kandorus for previously sealing them away. The town was destroyed, and Landorus fled.
At least that's my very long-winded theory. Does it make much sense?
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