[li]Make sure there's no save data. If there is, clear it by pressing up+b+select on the title screen.[/li]
[li]Start a new game.[/li]
[li]Name yourself Ash, and your Rival Blue.[/li]
[li]Go downstairs in front of the door.[/li]
[li]Save the game.[/li]
[li]Reset at a very specific timing between the yes/no box disappearing and the text int the text box changing.[/li]
[li]Continue the game.[/li]
[li]Go to your pokemon many, swap the second pokemon with the tenth, and then the eleventh with the ninth.[/li]
[li]Go to the bag and scroll down until the cursor stops flashing, then press a.[/li]
[li]Press down a a few times to free the cursor from being stuck.[/li]
[li]Scroll down until you see a Master Ball.[/li]
[li]Grab the item below it with select, and swap it with a second master ball farther down on the list.[/li]
[li]The mount of the item you toss changes where the door will take you when you leave.[/li]
I haven't finished the list yet, I've only done 0-80, but I will be updating this post as I try out more numbers.
(Also sorry if this is already a thing and I just missed it >.< )
Assume trying to exit takes you back to the room youre already in unless mentioned otherwise. Also assume that all stairs, ladders, elevators, and warp pads work normally unless mentioned otherwise.
0 (Pressing b when asked to toss items) Northern Cycling road gate. Both exits lead back inside, stairs work fine.
1 Upstairs room of gate with Exp All. Left exit takes you upstairs, right exit takes you to a glitch city.
2 Bottom room of the same gate as last time.
3 House in Saffron City of man who gives you TM29. No leaving.
4 Saffron City Pokemon Center. Healing works about as well as youd expect with this many pokemon, game crashed upon trying to deposit a pokemon in the pc. No leaving
5 Silph Co. Lobby. Exiting leads to a glitch city
7 Saffron City house with woman writing letter.
8 Saffron City gym. Attempting to leave leads you to the top left most warp.
9 Fighting Dojo.
10 Upstairs, Copycats house. Stairs work normally, leaving takes you upstairs.
11 House with a chansey. Cannot walk more than one block upwards into room, tiles vanish if they go offscreen, can walk out of bounds to the left or right causing a crash. (Interestingly, Reds house acts the same way once you toss the items if you dont leave right away.)
12 Indigo League, can (try to) fight the elite 4.
13 Cinnabar Island Pokemart.
15 Pokemon center.
16 Fossil reviving room in Cinnabar lab. Can visit entire lab, leaving lab leads to glitch city.
17 Cinnabar lab, room with pipes on display. Same effects as number 16, but glitch city has some scientists in it now.
18 Cinnabar Lab, room with Golduck for Rhydon trade. This time you cant see yourself when you go to glitch city.
19 Cinnabar Lab, main hallway. Hallway doors work as normal, trying to leave makes you come out of the left most door.
20 Cinnabar Gym.
21 Pokemon Mansion. Stairs and mew statues work fine. Falling off the balcony had a glitched animation. Back door leads to start.
22 House with the Good Rod. South door leads to glitch city. North door leads to a glitch city that is just vertical stripes of tiles.
23 House with old rod.
24 Seafoam islands, stuck walking on water.
25 Seafoam islands, ladder on ledge overlooking strength puzzle. Falling down holes gives a glitched animation, and can allow you to surf without the move surf. Leaving the cave brings you back.
26 Seafoam islands, top left ladder of floor B2.
27 Seafoam islands, top left ladder of floor B1.
28 Building in Fuchsia city with people talking about the safari zone warden. Leaving brings you to glitch city.
29 Fuchsia city gym. Leaving brings you to glitch city.
30 Safari zone gate. Paying to go in took away all of my glitched out amount of money. Wild pokemon, houses in safari zone, and leaving early were fine. South exit led to glitch city.
31 Safari zone wardens house. Leaving causes glitch city.
32 Fuchsia City Pokemon center. Unlike other centers, healing here was different. The usual glitched up healing played, with nurse joy filling the whole screen with glitch blocks, then she gave them back, and the PA said my safari game was over. But then instead of crashing, the palate became Vermillion citys orange one, everything disappeared but me and nurse joy, the gamefreak logo part of the intro played behind them in glitchy colors, they disappeared and the rest of the intro played normally, and then I was back in the center again, completely normal (or as normal as this glitch can be).
33 Bills familys house in Fuchsia.
34 Fuchsia Pokemart.
35 House with Cubone in Lavender town.
37 Mr. Fujis house, Lavender Town.
38 Top floor of pokemon tower.
39 Pokemon tower 6F.
40 Pokemon tower 5F. Stepping into the purified and protected zone caused the same sequence of sounds as stepping into it with super glitch active, and afterwards caused not one, but two unknown opcodes.
41 Pokemon tower 4F (unlike previous ones, entered floor from a higher floor instead of a lower one).
42 Pokemon tower 3F.
43 Pokemon tower 2F (also entered from a higher floor).
44 Pokemon tower lobby
45 Lavender town Pokemon Center.
46 Celadon Inn.
47 House in Celadon. Exit leads to glitch city.
48 Celadon Café. Exit leads to glitch city.
49 Celadon Prize corner. Exit leads to glitch city.
50 Celadon dept. store 5F. Going down to bottom and leaving leads to glitch city.
51 Celadon game corner (or whatever the casino is called). Exit leads to glitch city. Unfortunately could not check if slots work due to lacking a coin case.
52 Celadon gym. Exit leads to glitch city.
53 Celadon pokemon center.
54 Celadon mansion, room with Eevee. Could actually leave the room. Going all the way downstairs and exiting the building led to glitch city.
55 Celadon mansion rooftop, side without Eevee. Going all the way downstairs and exiting took me back to the roof, but this time coming out of the door to the Eevee room. Going all the way down again and out the back led to glitch city.
56 Celadon mansion 3F. Exiting the building led to the stairwell up towards Eevee on 3F. Going out the back went to glitch city again.
57 Celadon mansion 2F. Leaving the building led to the stairway to Eevee on 2F. Going out the back led to glitch city.
58 Celadon mansion 1F. Leaving caused me to enter through the back door. Going out the back caused me to appear on the stairs next to the back door.
59 Celadon dept. store elevator. Leaving took me back to Reds house. Choosing a floor let me exit into the store.
60 Celadon dept. store roof. Going down to bottom and leaving leads to glitch city.
61 Celadon dept. store 4F. Going down to bottom and leaving leads to glitch city.
62 Celadon dept. store 3F. Going down to bottom and leaving leads to glitch city.
63 Celadon dept. store 2F. Going down to bottom and leaving leads to glitch city.
64 Celadon dept. store lobby.
65 Underground path (Celadon to Lavender). Both exits work fine.
66 Blues champion room. Can walk straight past him into the hall of fame.
67 Underground path (Cerulean to Vermillion). Both exits work fine.
68 Hall of Fame (of course).
69 Glitch city made up almost entirely of the bottom right corner of a house repeated over and over (there are a few number tiles as well), game crashes shortly after entering. Game takes somewhat longer to load map when entering. Some sort of glitchy thing moving up towards the player before the crash.
70 Exactly the same as the last one, but with more number tiles in place of some house tiles.
71 Exactly the same as last two, but with fewer number tiles.
72 Exactly the same as last one, but the crash doesnt lead to candy colored stripes of doom, instead the music gets stuck and the player and glitch sprite disappear.
73 Lances room, complete with automatic walk in.
74 Same as 69-72, candy stripes of doom are back.
75 Another auto-crash house-filled map.
76 Another one.
77 And another.
78 Entrance to Victory road. Exiting takes you to some ladder in the cave.
79 Auto-crash house-filled map.
80 Auto-crash house-filled map.