Talk:Lightning Stone/@comment-2601:243:1203:CEEB:358A:6404:1BE2:81F4-20180919071656/@comment-35497604-20180923074135

Basically you'll need to fight Elemental Hall at

Intermediate +  (Need 3 teams) Advanced & Advanced + (Need 4 teams)

Then after defeating those battles, everything comes down to RNG