Addendum to GF 22796 Mew at beginning of Pokémon Yellow to make it Shiny

If you want to change party slot 1's Attack/Defense DVs to 15, 10 (highest sequence for a Shiny), try (PC items) before placing the Ether x213 at item slot 41 (bag)/wherever the "ASH" item used to be).

After the Mew battle, item slot 41 will be the default script; so you will have to place it again. However, you will need to find a new Ether. You can adjust the quantity of bag item 36 to warp from the player's house to Celadon City. Then you can acquire another Ether stack with the Celadon looping map trick (see https://glitchcity.wiki/Celadon_looping_map_trick ). Keep your original Q (0xFF) glitch Pokémon, as it knows Teleport and allows you to escape a Celadon City Glitch City, warping back to Pallet Town (provided you haven't used a Pokémon Center).

While scrolling the inventory, you may see an Ash stack before item 41. Ignore it and keep scrolling down until you find the Ash stack that is in item stack 41.

New PC items:

PC items 11 and 12 should also be #x## x0, as these two could mess up the code.

#13 x1
#14 x250 (Attack DV = 15 and Defense DV  = 10)
#15 x33
#16 x209 (near party region)
#17 x17
#18 x133 (Attack/Defense DV of party Pokémon 1)
#19 x106
#20 x112
#21 x201

Close the menu and this should apply the Attack and Defense DV of Pokémon 1.

Next, repeat but with these because we need to change Speed/Special to 10, 10 as well;


#13 x1
#14 x170 (Speed DV = 10 and Special DV  = 10)
#15 x33
#16 x209 (near party region)
#17 x17
#18 x134 (Speed/Special DV of party Pokémon 1)
#19 x106
#20 x112
#21 x201

Close the menu and this should apply the Speed and Special DV of Pokémon 1.

(HP is calculated independently and this should be enough to turn party Pokémon 1/Mew into a Shiny)

Practically, things may get complicated for getting x134 because you already got x133 earlier, and swapping two of the same item (including the null #x## item attempts to merge the stack). However, swap a different type of item (such as a Potion) into slot 18 first (the quantity shouldn't matter as we're just temporarily using it to avoid merging stacks). However, don't close the menu until the quantities are correct as above; as having them wrong (including to the temporary item) could cause a freeze because the script in the player's room will run every time the menu is closed (until you leave the room). Choose another null item slightly below PC item 21 to serve as the null item x134. Now swap that into slot 18 where you temporarily placed the other item, and you should end up with the list as above.