Wanna know more about that location now. :(
Shining Charm - When held makes it easier to encounter shiny Pokemon
Round Charm - Daycare man will find eggs quicker. When held.
100% for finding eggs quicker - that'll help RNGers too etc. But Shining Charm...? No. Just... I'd much rather find a shiny randomly than use a set item, despite never finding one in the first place. :x