Ash and Greninja, The Protectors of Kalos

Ever since Ash and Greninja became gods, they practice their new powers to improve their battle skills, but when a new enemy arises. it's Ash and Greninja's time to shine, join Ash and Greninja along with Serena and Braixen to repel this threat on Kalos, one question is....are they ready to fight? or are they not? read to find out