The hacking on September 17
Last night, we were hacked. We managed to identify and fix the vulnerability and get PS back up and running in a matter of hours, but the attacker did make off with a database dump.
Our passwords are stored in an encrypted format and are relatively difficult to brute-force (technical details: we were using bcrypt) but you should change yours anyway. That includes on PS, and everywhere else you were using the same password (you should not use the same password everywhere else). Other than that, there's no need to worry: our passwords are encrypted enough that you have plenty of time to change your password before it's a problem.
?Zarel on Sep 18, 2016
Source: http://pokemonshowdown.com
So ya, I just thought I'd get this message across if some of you PS users didn't get the message
tr;dr:If you have another account somewhere with a similar user/password combination, it may be best to change them right away!