Poketale- The Human Trainer

It has been several years since the war between humans and monsters ended. The monsters are underground and the humans live in victory. But in the underground live mysterious creatures called Pokemon. Monsters soon learned to live with these creatures and befriend them. Their friendships grew so much that the monsters very essence, or their SOUL, has become tied to their Pokemon friends. Some play with Pokemon. Others use them for help, either in work or in general. Some however, BATTLE with them.
It has been too long since monsters were forced underground. Now, the monsters take in arms with their powerful friends, and with those new powers, the monsters plan to destroy the barrier and take back the surface. Only one problem. The BARRIER that shields them from the surface. In order to break it, the monsters must collect seven human SOULS, which then must be fused with a monster's SOUL in order to gain the power necessary to destroy the BARRIER. They already have six. All they need is one more...
And right on cue, the seventh human, Frisk, falls into the Underground, awaiting his fate.