...well... not one minute into the 'game' and my cousin figured out what was going on. o.o Am I really that obvious?
"So that Combusken's your best friend, right?"
"...how'd you know?"
"'cause you're gonna kill him."
"..."
"And that Eevee... is your brother?"
"..."
"Oh, is there a Ninetales somewhere in here? That you and your partner, that is, once you join that organization, are assigned to capture? Is the Ninetales an idiot? Is that Eevee gonna train to kill ya? Will Ninetales learn how to clone himself- like, use Double Team or something? Will Eevee learn an attack that'll make one of his paws all electrified? Does the pokemon you're gonna work with have a giant sword? ...c'mon, I've got this in the bag."
"...*returns to playing DS*"
That's basically how it worked. o.o