In PMD; Explorers of Sky, in order to advance through Aegis Cave you need to find and KO certain Unown so that they drop an Unown-Stone.
For example, an Unown-L would drop an L-Stone, an Unown B would drop a B-Stone, etc.
If I were to collect all 28 Unown Stones (the alphabet + ! and ?), would anything special happen?