Credits:

Defa

How To

Add the following ASM routine to free space (see guide 1.10) and note the offset

    push  {lr}
    ldr   r1, =(0x020370C0) @var4
    ldrh  r0, [r1]
    mov   r2, #100
    mul   r2, r0
    ldr   r0, =(0x02024284) @gPlayerParty
    add   r0, r0, r2
    ldrh  r1, [r1, #2] @var5
    ldr   r2, =(0x02021CD0) @buffer1
    ldr   r3, =(0x0803FBE9) @GetMonData
    bl    linker
    ldr   r1, =(0x020370D0) @varResult
    strh  r0, [r1, #0]
    pop   {pc}
linker: bx r3

Set var4 to the party slot

Set var5 to the number of the data you want to retrieve (List Here)

Use callasm <offset+1> as usual. The returning value is stored in varResult

NOTE: If you set var5 to 2 (nickname) or 7 (OT name), the text string is stored in buffer1; varResult is set to the maximum length of the text string (10 for nickname, 3 for nickname if it's an Egg, 7 for nickname if it's a Bad Egg, 7 for OT name). NOTE: Avoid to set var5 to 81 (known Moves), it's a bit complicated to set up and the returning value is not easy to interpret. If you need to check whether a Pokémon knows a certain Move, set var5 to 13 (Move 1), then make a loop where you check whether varResult is equal to the Move id and add 1 to var5 three times to check all Move slots.

Example Script:

section0:
  setvar var4 0 #first party slot
  setvar var5 13 #Mon_Data_Move1
  goto section1 #loop

section1:
  callasm <offset+1> #routine
  if.compare.goto varResult == 7 section2 #check for Fire Punch (Move id 7)
  addvar var5 1 #check the next Move slot
  if.compare.goto var5 < 17 section1 #loop back
  msgbox.npc <auto> #loop ends, the Pokemon does not know the Move
{
The Pokémon does not know Fire Punch.
}
  end

section2: #the Pokemon knows the Move
  subvar var5 12 #optional, if you want to know the slot
  buffernumber buffer1 0x8005 #var5
  msgbox.npc <auto>
{
The Pokémon knows Fire Punch,
it's in slot [buffer1].
}
  end

Happy Hacking!