There is no powerful Pokemon. All the Pokemon found in the ruins are Unown. The special ones you may be thinking of are the new "?" and "!" Unown.
catch all the different unowns at lower right in the ruins.
dont cheat it ruins the game
At the top of the town wih the ruins with only unowns in it. The building with the old man standing out the front
You can find the fire stone in: Fuego Ironworks Solaceon Ruins (by using the dowsing machine) The Sinnoh underground
I think you are supposed to catch all versions of Unown in the ruins of Alf
Arceus
The Solaceon Ruins.
I think you have to find a special pokemon
lol there are no eterna ruins that was just in the anime.
in the solaceon ruins.
you get it at the solaceon ruins at the end of it
you go in from the veilstone way
You can find the M form of Unown in the Solaceon Ruins of Pokemon Platinum. This form of Unown appears in the dead-end rooms of the Ruins.
Unown. In the solaceon ruins
yes in the Solaceon Ruins
in the socalen or what ever ruins
its in the ruins of solance town.