Xillusions

So i hav been hunt for poke then i saw a guy who appeard without a name on his head, he then dissapear then appeard in other place without moving. So i want some explaination about this. As u can see i got to inspect him then i cannot inspect him after a few second. After that he dissapeard. Then he just pop up there without name and i cannot inspect him. At first i though that because of setting that i cannot see his name but then someone else is there with his name i can see. This happen at the Moon by the way. So can anyone explaine wht is happening.