Encounter table manipulation Super Glitch Yellow

This is a complicated but interesting means of corrupting the wild encounter table with Super Glitch I discovered, which fixes your name and party menu at the same time so you can save without the save file being destroyed and catch Pokémon to keep in the party without the "wild appeared" glitch (see https://www.youtube.com/watch?v=ELDCr6fxZMY).

It is also the only known way to get a full 3TrainerPoké battle without arbitrary code execution.

--Requirements--

Master Balls, Rare Candies, HM04 Strength.

Item 3's quantity must be 1.
Item 4 must be a Cancel.
Item 21 must be a Master Ball.

--Steps--

Step 1. Obtain a Pokémon with Super Glitch with move 1 https://bulbapedia.bulbagarden.net/wiki/Super_Glitch_(move)

Step 2. Go to Cerulean City Pokémon Center and go to deposit. On the deposit menu view the summary of the Super Glitch Pokémon. If you're lucky your number of Pokémon counter will become 0.

Step 3. Deposit the Pokémon while still on the menu to underflow the counter to 255, then withdraw a Q (hex:FF) to keep it at 255 and get a party menu that doesn't freeze the game.

Step 4. Swap Pokémon 1 with Pokémon 2.

Step 5. Go outside and walk to Route 4, and open the menu with a bush on the top-left corner of the screen. Teach Pokémon 1 HM04 Strength.

Step 6. Use Rare Candies to evolve it into a Kangaskhan and have it learn Tail Whip at Level 31.

Step 7. Enter battle ("wild appeared" glitch will occur), swap Tail Whip to slot 2, reduce its PP to 21 (hex:15), then run away. This will allow for a Mew encounter later. You can use another PP value to get another Pokémon from the decimal field on the big hex list. (see http://glitchcity.info/wiki/The_Big_HEX_List)

Step 8. Swap Pokémon 1 with Pokémon 42. This corrupts the encounters on Route 4, so you can do this to get one unintended encounter if you want, but since our name (affecting ability to keep a save file) and party menu is broken it's a good idea to continue the remaining steps to fix them.

Step 9. Swap Pokémon 11 with Pokémon 1. This combined with the right items above (the quantity of 1 in slot 3, the Cancel in slot 4 and the Master Ball in slot 21) will give you a Pokémon applicable for the slot 187 swap later.

Step 10. Raise Pokémon 3 to Level 80, go to switch it and scroll down (not up; this avoids a potential glitch that messes up the number of Pokémon in the party early) and switch it with Pokémon 186. Your name is now fixed with a hex:50 (dec:80) terminator, and you can save.

Step 11. Swap Pokémon 187 with Pokémon 1 (you can do this just after step 10 by moving one more slot down, going to switch it and then scrolling to slot 1). A strange slowdown effect may occur. If the game doesn't freeze, you're free to save and reset the game and get a chance of finding an unintended Pokémon.

The swap from earlier when Kangaskhan had 21 PP on move 2 allows for an uncommon encounter with Mew.

Sadly after one encounter or changing routes, the corrupted encounter table will be fixed, so you must reset the game until you find the Pokémon you want.