If you haven't watched Gravity Falls, this will contain major spoilers.
In Double Dipper, S1, Dipper creates 10 clones, while clone 3 and 4 rush out with Robbie's bike and we never see it. But in the credits, we see a photo of them in a tent with raincoats, and we don't see Robbie's bike. You can find the Dipper photo on the right at 0:30 of the video.
They have raincoats on, and since they have raincoats, they can't be killed due to the fact that raincoats protect against rain. The video proves that they are alive, and a reason. Robbie isn't seen for much in the rest of the show, it could either be because he was looking for his bike, or he just had other stuff to do. Dipper 3/4 lived, and this is proof.
WARNING - I do not own this video. It is not my channel.
In Double Dipper, S1, Dipper creates 10 clones, while clone 3 and 4 rush out with Robbie's bike and we never see it. But in the credits, we see a photo of them in a tent with raincoats, and we don't see Robbie's bike. You can find the Dipper photo on the right at 0:30 of the video.
WARNING - I do not own this video. It is not my channel.