Personally spamming the focus button the entire didn't work for me. I gathered ALL animals and ate all of the grass before camping my group ot at the egg. Once I my group was at maximum capacity I started spamming it. And I spammed the HELL out of it. Another FYI the spamming method worked better for me on the PS4 since the you can hit all four buttons on top compared to the 2 on the vita. Good luck.