Add accurate Mega Evolution message

Needs to be added to the client in the future, in addition to (using
Blastoise as an example):

The opposing Blastoise has Mega Evolved into Mega Blastoise!

- It doesn't mention X/Y for Charizard/Mewtwo
Gastro Acid fails against Stance Change
SmellingSalt now has 70 base power
SmellingSalt is now Smelling Salts
Dazzling Gleam hits all adjacent foes
Merge pull request #443 from TalkTakesTime/master

Dazzling Gleam hits all adjacent foes
Merge remote-tracking branch 'upstream/master'