Before you get your first pokemon save the game. go through the game all the way until you catch another pokemon DONT SAVE. put your starter in the box in the pokemon center, switch boxes, as it says saving...do not turn off the power, turn it off. when you turn the power back on, you should be back in the lab, pick a different pokemon this time (the one you picked before will be in the box) do this again, putting both the pokemon in the box and switching boxes, then grab the last pokemon and there you have all 3.I've done it it does work.