Is there anything special about the Ruins of Alph?

I used to think that you could catch a legendary there after solving the puzzle and getting different Unowns, but it says you cant catch any there, so does it like release a legendary or something, also, if there is something special about it, how do you solve the puzzle or do whatever it is you need to do to make said special thing happen? Thanks!

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In Crystal, HeartGold, and SoulSilver, each puzzle chamber has a word on the far wall that is a hint to unlocking a secret room. When the player completes a certain criterion, the secret room opens, revealing several items. Additionally, in these games, completing the slide puzzles reveals part of the history of Unown written on the floor of the underground hall. In the Japanese version of Crystal, a scientist theorizes that the sudden appearance of these patterns is related to the newly-built Pokémon Communication Center and the radio waves emanating from it.

The upper-right entrance 1, near the Route 36 entrance, requires no HMs to access. In Pokémon Crystal, HeartGold, and SoulSilver, the far wall reads escape upon inspection. Using an Escape Rope there opens a hidden room. In Crystal, the item is consumed and the player must re-enter the chamber in order to reach the hidden room. In HeartGold and SoulSilver, the item is not consumed and the room opens immediately.

This room contains a berry, PSNcureberry, heal powder, and energy powder.

This room contains a heal powder, energy root, gold berry, and moon stone.

This room contains a revival herb, charcoal, gold berry, and mysteryberry.

This room contains a stardust, star piece, mysteryberry, and mystic water.source

There is no mention of a legendary encounter in the Ruins of Alph, just the ! and ? Unowns after getting all others.

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