Oh I see. Yeah, Complications chose a rather odd time to leave. My theories on how it works is thus: Raeodin is looking for powerful legendary pokemon, and one (presumably Groudon, given the desert) has shown up in the starting town. Burst Hearts work like pokeballs, where they are thrown and then capture pokemon, but instead of releasing them, they are dormant until a sufficient "connection" has been made between the pokemon and trainer. After this has been reached, the human can merge with the Pokemon and take on qualities of both. To make the connection, one must travel into some odd mental realm (this is where I kind of go into theory) and train with the pokemon.
That make any sense at all?