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Generation I Glitch Discussion

Sprite Change explanation - Page 1

Sprite Change explanation

Posted by: Mecha_Coco
Date: 2016-02-24 10:15:10
Hi everyone,
I'm new here. I have a question regarding a lesser known glitch, or at least one you can't find much about on the internet: the sprite change glitch. If anyone doesn't know what I'm talking about:
https://www.youtube.com/watch?v=3-mzSaAxH38
Back when I played my Pokémon Red cartridge on Game Boy, I stumbled upon this glitch by accident, but in a different manner. The guy in the video I linked changes the player's sprite by checking the pc, whereas I accomplished it by using Strength or Surf in different locations. I made a small video of my experiments using my phone, on which I'm currently playing Red. Here's the download link: http://www.filedropper.com/pkmnspintransfglitch_1
(EDIT: I uploaded the video on my Youtube, just in case)
https://youtu.be/P_gWeUM4d5I
Sometimes I get a weird half-snake sprite, which doesn't seem to happen with the "check-the-pc" version.

So, my question is: why does this happen? It would be fun to understand the mechanics behind the glitch.
And, of course, I hope this question hasn't been answered already. I searched the forums but nothing turned up.
Thanks in advance!