Document the origin of MissingNo's base stats.

constants/pokemon_constants.asm

@@ -136,7 +136,7 @@ const_value = 1
 	const MISSINGNO_86 ; $86
 	const MISSINGNO_87 ; $87
 	const MUK          ; $88
-	const MISSINGNO_8A ; $8A
+	const MISSINGNO_89 ; $89
 	const KINGLER      ; $8A
 	const CLOYSTER     ; $8B
 	const MISSINGNO_8C ; $8C

data/pokedex_entries.asm

@@ -1256,4 +1256,4 @@ MissingNoDexEntry:
 	db "???@"
 	db 10 ; 1.0 m
 	db 100 ; 10.0 kg
-	db 0,"コメント さくせいちゅう@" ; コメント作成中 (Comment to be written)
+	text "コメント さくせいちゅう@" ; コメント作成中 (Comment to be written)

data/trainer_parties.asm

@@ -258,6 +258,14 @@ BikerData:
 	db 33,WEEZING,0
 	db 26,GRIMER,GRIMER,GRIMER,GRIMER,0
 ; Route 17
+	; From https://www.smogon.com/smog/issue27/glitch:
+	; 0E:5FC2 is offset of the ending 0 for this first Biker on Route 17.
+	; BaseStats + (MonBaseStatsEnd - MonBaseStats) * (000 - 1) = $5FC2;
+	; that's the formula from GetMonHeader for the base stats of mon #000.
+	; (BaseStats = $43DE and BANK(BaseStats) = $0E.)
+	; Finally, PokedexOrder lists 0 as the dex ID for every MissingNo.
+	; The result is that this data gets interpreted as the base stats
+	; for MissingNo: 0,33,MUK,0,29,VOLTORB,VOLTORB,0,...,28,GRIMER,GRIMER.
 	db 28,WEEZING,KOFFING,WEEZING,0
 	db 33,MUK,0
 	db 29,VOLTORB,VOLTORB,0