This is my first project. The instructions are shown in the game. So, have fun! (and don't forget to turn the sound) If you have a bug, press space! when you're in the gun, do not click on the arrows.
Thanks to @Tralla_kid for his project about scrolling http://scratch.mit.edu/projects/597191/ and BobbyF for the sound of pikachu http://scratch.mit.edu/projects/1956398/