After enlisting the help of a kind internet stranger with CFW, this is what I got from cloning an alolan rattata and caterpie and applying the respective codes on separate clones.
So one nice thing to note: the PIDs are different!
I'm not too familiar with pokémon data, but it is interesting to me how the 3 shiny caterpies have very close PIDs. Those three were also done in one batch (server request).
Edit: A next thing to test would be if the PIDs stay different across different batches. i.e. applying the shiny code to the same OGs but in a separate server request.
Note
PID
OT TID
OT SID
IV Block
HP
Atk
Def
SpA
SpD
Spe
Rattata
Change PID/Shinify
197851181
33043
29428
00010010110101001010101111010101
21
30
10
13
9
9
Change PID/Shinify
77788997
33043
29428
00100001001001101001000000011110
30
0
4
18
16
13
Change PID/Shinify
96138845
33043
29428
00101111011110001111010001100111
7
3
29
23
23
17
Traded/Shinify
1849335667
33724
29428
00011000111011111001110101111111
31
11
7
14
12
31
OG
1849335667
33043
29428
00011000111011111001110101111111
31
11
7
14
12
31
Caterpie
Change PID/Shinify
3940030783
33043
29428
00011000010010110000110101110110
22
11
3
4
12
22
Change PID/Shinify
3954186327
33043
29428
00100110100111010111000110111111
31
13
28
9
19
26
Change PID/Shinify
3834124143
33043
29428
00110100111011110101011000001000
8
16
21
14
26
30
6IV Code
1272958081
33043
29428
00111111111111111111111111111111
31
31
31
31
31
31
OG
1272958081
33043
29428
00111001111111111111111010011111
31
20
31
31
28
31