Title says it all! I made this two years ago when pokémon go first came out and was super popular. It's function is quite simple, to hatch your eggs by simulated walking. The shaking of the phone holder in the video is only because there is no phone in it, it is smooth when it is loaded down with weight. The mechanism to reverse the chain's motion perpetually was really fun to create, it is something out of my typical skillset with k'nex, but I am really proud with the result. The first video is an overview of the whole thing with my commentary. I believe the video was recorded one year ago.