Not sure about the steps, I just used a frame 1 spread, which is much easier. Also, when he's roaming at routes with Pokémon lower then him, you can use a lvl ~39 Pokémon with Max Repel, so you won't encounter other Pokémon.
And for the Button Press Combo, at 1 sec before your actual time, click the game and right after that hold the button as seen in the Combo. Don't release that button until the Gamefream movie stars. So when you see that star shooting over your screen, you can let go and proceed into the game.
Just hit me with more VM's when you're stuck. :)