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IsInJohto::
; Return 0 if the player is in Johto, and 1 in Kanto.
ld a, [wMapGroup]
ld b, a
ld a, [wMapNumber]
ld c, a
call GetWorldMapLocation
cp FAST_SHIP
jr z, .Johto
cp SPECIAL_MAP
jr nz, .CheckRegion
ld a, [wBackupMapGroup]
ld b, a
ld a, [wBackupMapNumber]
ld c, a
call GetWorldMapLocation
.CheckRegion:
cp KANTO_LANDMARK
jr nc, .Kanto
.Johto:
xor a
ret
.Kanto:
ld a, 1
ret
ret_2f3e::
ret
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