Oh, okay. So open up your DS again, and if you have Step Counter poketch app, switch to that. Clear it if you need to. If you don't have it, you'll have to count yourself. Walk 128 steps around the house, make sure you don't leave it though. Try and make it so on your 128th step you're in front of Oak again. If you have to count yourself, a step is actually walking forward or turning + walking. Just turning does not count as a step. Once you've done that, open up your journal, do your 254 flips, and talk to Oak.
Try not to mess up too, lol. The birds are a pain to redo because you have to kill all of them off and beat the E4 before you can get another try at them.