Add a challengeable Doubles LC format
Add a challengeable Doubles LC format

xfix/Pokemon-Showdown,Zarel/Pokemon-Showdown,svivian/Pokemon-Showdown,svivian/Pokemon-Showdown,xfix/Pokemon-Showdown,xfix/Pokemon-Showdown,Zarel/Pokemon-Showdown,svivian/Pokemon-Showdown,Zarel/Pokemon-Showdown,svivian/Pokemon-Showdown,xfix/Pokemon-Showdown,svivian/Pokemon-Showdown,xfix/Pokemon-Showdown