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Since a few people asked in the responses, they are separate but related glitches. Surfing up the coast of cinnabar causes a bug where you're on water but the game uses the grass encounter table. Safari zone glitch was likely discovered first
If the last zone you were in was the safari zone, you can use this to encounter safari zone pokemon normally, making them much easier to catch. Encountering missingno requires loading invalid data into the encounter table (usually the player name)
I'll be going into much more detail on these glitches at @rustconf! Make sure you buy a ticket!https://rustconf.com/
But to answer the question a few of you asked "aren't these the same glitch?" They both take advantage of the same bug, but with different steps first that achieve different outcomes. To me that makes them different glitches
How did the “talk to the guy at veridian city, then fly to the island and swim on the. East coast” load the invalid data?
During the battle where the old man catches a weedle, the player name needs to temporarily be changed to "OLD MAN". The grass encounter table is where your name gets stored in the mean time. It was not zeroed after
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