Replace Sludge Wave with Sludge Bomb on Gengar

Sludge Bomb has higher usage and is arguably better than Sludge Wave on Gengar.
Merge pull request #821 from Relados/patch-54

Replace Sludge Wave with Sludge Bomb on Gengar
Fix crash when a battle isn't able to be started (e.g., server lockdown)
Fix coding style
Merge pull request #823 from kotarou3/tournaments

Fix crash when a battle isn't able to be started (e.g., server lockdown)