I'd like to hear from Joe and others as to their methodology for searching for Mega Stones. Is it just a matter of wandering everywhere from 8 p.m.-9 p.m. and talking to every NPC, checking every interactive object, using the item that detects invisible objects (if it's back), etc?
EDIT: ^^^ Ah so it's trial and error. Things change in that time period and you just come across the Mega Stones.
Only thing is Trevor in Geosenge Town telling you that ____ supposedly has a mega evolution. He's currently telling me Tyranitar has one. Well that's fine, but tell me where the bloody stone is