It says that the ZZAZZ Glitch works with Pokemon with Special Values 251, 252, 254, and 255. I decided to see what happened when I attempted with a 253.
It the oddest thing. It was a upside down Missingno. with Charizard M's Name. He had two pokemon, one called Trainer that was actually a Level 32 Magnetmite and a Level 32 Missingno. which was moved several pixels to side over and reversed. Truly odd experience.