Game:

Pokémon Red and Blue (1996)

Duration: 2:45

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32

Notes:
A Select glitch on position 40 that lets you initiate a battle any Pokémon 0-199 or Trainers from 200-255; based on the Special stat of the Pokémon you swap. The battles take place in the Name Rater's house.

I have the description mirrored at https://glitchcity.wiki/Encounter_table_manipulation_Select_glitch_(Red/Green/Blue)

Steps:
The following is an example method tested on Japanese Red v1.0:

Go to the Name Rater's house in Lavender Town. (If using PC storage box, go to the Pokémon Center to press Select on storage box item 40 first)
Do a Select glitch with item 40 on the desired party Pokémon. (If Cancel, erase it using a x255 stack directly below it. If the game freezes, try the Select glitch freeze workaround (have an アネﾞデパミﾞ (FF) at the top of the party)

Save the game and walk around to encounter a Pokémon while still in the house. Reset if the desired Pokémon isn't found and walk around again.

Conversion:

Assuming the swap is done on Pokémon 1;

1st Pokémon Defense Byte 2 becomes the grass/cave encounter rate ;D152 to D806
1st Pokémon Speed Byte 1 becomes the first level slot ;D153 to D807
1st Pokémon Speed Byte 2 becomes the first encounter slot (species) ;D154 to D808
1st Pokémon Special Byte 1 becomes the second level slot ;D155 to D809
1st Pokémon Special Byte 2 becomes the second encounter slot (species) ;D156 to D80A
Ideally the Defense of Pokémon 1 should be not too low, while the Speed and Special can be used to match a Pokémon with the ID desired by the player.

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