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-rw-r--r--engine/link/link.asm25
1 files changed, 16 insertions, 9 deletions
diff --git a/engine/link/link.asm b/engine/link/link.asm
index 53f0e004..a0f67f40 100644
--- a/engine/link/link.asm
+++ b/engine/link/link.asm
@@ -1719,24 +1719,31 @@ LinkTrade:
call LoadTradeScreenBorder
call SetTradeRoomBGPals
call WaitBGMap
- ld b, $1
+
+; Check if either of the Pokémon sent was a Mew or Celebi, and send a different
+; byte depending on that. Presumably this would've been some prevention against
+; illicit trade machines, but it doesn't seem like a very effective one.
+; Removing this code breaks link compatibility with the vanilla gen2 games, but
+; has otherwise no consequence.
+ ld b, 1
pop af
ld c, a
cp MEW
- jr z, .loop
+ jr z, .send_checkbyte
ld a, [wCurPartySpecies]
cp MEW
- jr z, .loop
- ld b, $2
+ jr z, .send_checkbyte
+ ld b, 2
ld a, c
cp CELEBI
- jr z, .loop
+ jr z, .send_checkbyte
ld a, [wCurPartySpecies]
cp CELEBI
- jr z, .loop
- ld b, $0
+ jr z, .send_checkbyte
-.loop
+; Send the byte in a loop until the desired byte has been received.
+ ld b, 0
+.send_checkbyte
ld a, b
ld [wPlayerLinkAction], a
push bc
@@ -1750,7 +1757,7 @@ LinkTrade:
jr z, .save
ld a, [wOtherPlayerLinkAction]
cp b
- jr nz, .loop
+ jr nz, .send_checkbyte
.save
farcall SaveAfterLinkTrade