Yes, you heard me. Destiny Islands is destroyed. But don't worry. you can go and relax on the beach soon enough. ON THE DARKSIDE!!!
Anyways... This is all part of a big plot, kinda like the subspace emissary in Brawl, but It's kinda different. Your opponents are... THE HEARTLESS!! you got it; They are now traveling from stage to stage, starting on Destinty Islands where the Darkside spawns them.
Wait... what's this? Simply defeat the Darkside, eh? Well.. I DON'T THINK SO!!!
Here is his Statistics:
DarksideHP: 2000
MP: 500
Attacks:
1, 3 or 5 -> Slam - 500 damage, 25 MP
4 or 6 -> Spawn [In Battle] - 100 damage, 75MP, spawns 10 Shadows
2 -> Crush - 2500 damage, 200MP
Spawn [Not Battle] - 0 damage, 0MP, spawns 50 of every heartless