Added Plasmanta/CAP19 Playtest Stuff

Guess I'm the guy who gets to take a stab at the CAP19 code additions.

Added Plasmanta pokedex code, formats-data, and learnsets-g6. Didn't add to learnsets.js since the file was too large to edit in my browser, so if someone else could do so that would be great. Also, in config/formats, I saw your preliminary code for the playtest, but removed mawilite from the banlist since the CAP19 creation process started before the mawilite ban.