Mega Stones can be taken from other Pokemon
Gen 5 Chatter

This was not done in 6b9c179524e2d295e690dd59a7273588b1eb886b
Redir had two help messages
Change Beginner's Guide link in /intro
UUs

Based on Oct-Nov-Dec statistics. These tiers will be updated monthly. The consensus appears to be that UU Beta should be implemented now as an "unofficial" tier with an active ladder. LC UU and Doubles UU have not been discussed to my knowledge.
Replace VGC 2013 with GBU Doubles
Use "Standard GBU" rules for GBU Singles/Doubles
Use "UU (beta)" for teambuilder formats
Belch can't be called by Assist
Tangela and Yanma are now banned in LC
Smogon Doubles UU is challenge-only
Global ranks can't bypass in modchat in private rooms
Implement Hold Back
Sync learnsets
Sync learnsets
Allow direct events to fire on fainted pokemon
This is the first step to fixing faint order
Better comments for sockets.js
Implement Celebrate
Fix modchat
modchat's embarrassingly been broken since the rooms update, but as
of now there are separate roommodchat and battlemodchat options
to set the default modchat level. I'll probably add the ability
for per-room modchat to be permanent later.
Fix Mega stones

They could be knocked of from a Pokemon that has Mega Evolved