This format applies to Pokémon fought in the Battle Subway and PWT. Battle Frontier too if you are considering Gen 4.

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WIP, do not use yet, guide is very messy, hard to read, and doesn't properly denote offsets at the moment.

GG = Species (Read in order of 01 00)
HH = Move 1 index number (03 02)
II = Move 2 index number (05 04)
JJ = Move 3 index number (07 06)
KK = Move 4 index number (09 08)
LL = EV spread (Formatted in binary, 000000 -> HP ATK DEF SPATK SPDEF SPD)
MM = Ability index number
NN = Item index number (0D 0C)

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Example for GG-LL & NN:

We'll be using Patrat for this example.
00 01 = F8 01
F8 01 -> 01 F8 -> 1F8 -> 504
504 is Patrat's index number, so your first two values will be F8 01. This applies to move and item index as well, F8 01 in a move or item slot would denote for Shell Smash and RageCandyBar respectively.

Example for EV spreads:

0 is changed to 1 if that stat has investment.
EVs are spread equally and cannot be micromanaged. (ex. 010001 = 255 ATK & SPD, 101010 = 170 HP, DEF, & SPDEF)
First, EV your binary string, then convert binary to hex.
000101 -> 05

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You cannot edit a Pokemon's ability unfortunately. (Same applies to gender and shininess, but this isn't as notable.)

External Links:

Pokémon Nat Dex Numbers
Move Indexes
Nature Indexes
Item Indexes

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