diff --git a/README.md b/README.md
index 92ef1441..aff1dfaf 100644
--- a/README.md
+++ b/README.md
@@ -259,7 +259,7 @@ Credits
 * Chatot4444 - Assisting with gym scaling code
 * ZumiIsawhat? - Restorations of beta OST
 * Helix Chamber, RacieBeep, loumilouminosus, Orchid, GBCRetro, & catstorm26 - Prototype Pokémon sprites
-* Vortyne - Reused a bit of code from their pureRGB hack, which was used to assist with making MissingNo. stable. Assisted in bug fixes.
+* Vortyne - Reused a bit of code from their pureRGB hack. Assisted in bug fixes.
 * jojobear13 & Mateo - Move deleter & move relearner functionality from Shin Pokered, followed [this guide](https://github.com/jojobear13/shinpokered/blob/master/how%20to%20guides/how%20to%20add%20the%20move%20relearner%26deleter.txt). Tweaks were made to make it compatible with the pokered version we worked off of.
 * Rangi - Reused a bit of code from their Red* / Blue* hack to make HMs usable in the overworld!
 * 大吟醸 (Daiginjo) - Assistance in translating the Tamamushi University Student Book, allowing for an accurate adaptation of the location.
diff --git a/constants/pokedex_constants.asm b/constants/pokedex_constants.asm
index 7997a025..07d014c3 100644
--- a/constants/pokedex_constants.asm
+++ b/constants/pokedex_constants.asm
@@ -3,8 +3,7 @@
 ; - BaseStats (see data/pokemon/base_stats.asm)
 ; - MonPartyData (see data/pokemon/menu_icons.asm)
 ; - MonsterPalettes (see data/pokemon/palettes.asm)
-	const_def
-	const DEX_MISSINGNO  ; 0	(000)
+	const_def 1
 	const DEX_BULBASAUR  ; 1	(001)
 	const DEX_IVYSAUR    ; 2	(002)
 	const DEX_VENUSAUR   ; 3	(003)
@@ -257,4 +256,4 @@
 	const DEX_MELTAN	 ; 	    (250)
 	const DEX_MELMETAL   ; 	   	(251)
 
-DEF NUM_POKEMON EQU const_value
+DEF NUM_POKEMON EQU const_value - 1
diff --git a/constants/pokemon_constants.asm b/constants/pokemon_constants.asm
index 8ce0cef8..5548dfeb 100644
--- a/constants/pokemon_constants.asm
+++ b/constants/pokemon_constants.asm
@@ -257,11 +257,10 @@
 	const WEEZING_G		     ; $F8
 	const TAUROS_P		     ; $F9
 	const TAUROS_PA		     ; $FA
-	const TAUROS_PB		     ; $FB
-	const MISSINGNO          ; $FC	
-	const FOSSIL_KABUTOPS    ; $FD	(was B6)
-	const FOSSIL_AERODACTYL  ; $FE	(was B7)
-	const MON_GHOST          ; $FF	(was B8, need to make sure we can still put something here)
+	const TAUROS_PB		     ; $FB	
+	const FOSSIL_KABUTOPS    ; $FC	(was B6)
+	const FOSSIL_AERODACTYL  ; $FD	(was B7)
+	const MON_GHOST          ; $FE	(was B8)
 	
 DEF NUM_POKEMON_INDEXES EQU const_value - 1
 
diff --git a/data/pokemon/base_stats.asm b/data/pokemon/base_stats.asm
index 57e1a459..a6462560 100644
--- a/data/pokemon/base_stats.asm
+++ b/data/pokemon/base_stats.asm
@@ -251,7 +251,4 @@ INCLUDE "data/pokemon/base_stats/mewtwo.asm"
 INCLUDE "data/pokemon/base_stats/mew.asm"
 INCLUDE "data/pokemon/base_stats/meltan.asm"
 INCLUDE "data/pokemon/base_stats/melmetal.asm"
-	assert_table_length NUM_POKEMON - 1 ; discount MissingNo
-
-MissingnoBaseStats::
-INCLUDE "data/pokemon/base_stats/missingno.asm"
+	assert_table_length NUM_POKEMON
diff --git a/data/pokemon/cries.asm b/data/pokemon/cries.asm
index a3cd1c73..3857c8ca 100644
--- a/data/pokemon/cries.asm
+++ b/data/pokemon/cries.asm
@@ -257,7 +257,6 @@ CryData::
 	mon_cry SFX_CRY_1D, $11, $40 ; Tauros-P
 	mon_cry SFX_CRY_1D, $11, $40 ; Tauros-PA
 	mon_cry SFX_CRY_1D, $11, $40 ; Tauros-PB
-	mon_cry SFX_CRY_00, $00, $00 ; MissingNo.
 	mon_cry SFX_CRY_18, $EE, $01 ; MissingNo. (Kabutops Fossil)
 	mon_cry SFX_CRY_23, $20, $F0 ; MissingNo. (Aerodactyl Fossil)
 	mon_cry SFX_CRY_06, $00, $00 ; MissingNo. (Ghost)
diff --git a/data/pokemon/dex_entries.asm b/data/pokemon/dex_entries.asm
index 1bd3e9fc..f955c673 100644
--- a/data/pokemon/dex_entries.asm
+++ b/data/pokemon/dex_entries.asm
@@ -254,7 +254,6 @@ PokedexEntryPointers:
 	dw MissingNoDexEntry
 	dw MissingNoDexEntry
 	dw MissingNoDexEntry
-	dw MissingNoDexEntry
 	assert_table_length NUM_POKEMON_INDEXES
 
 ; string: species name
diff --git a/data/pokemon/dex_order.asm b/data/pokemon/dex_order.asm
index 61f0b30f..a85ec84b 100644
--- a/data/pokemon/dex_order.asm
+++ b/data/pokemon/dex_order.asm
@@ -251,7 +251,6 @@ PokedexOrder:
 	db DEX_TAUROS_P
 	db DEX_TAUROS_PA
 	db DEX_TAUROS_PB
-	db DEX_MISSINGNO
 	db 0 ; MISSINGNO.
 	db 0 ; MISSINGNO.
 	db 0 ; MISSINGNO.
diff --git a/data/pokemon/evos_moves.asm b/data/pokemon/evos_moves.asm
index a6eb6f84..f597e696 100644
--- a/data/pokemon/evos_moves.asm
+++ b/data/pokemon/evos_moves.asm
@@ -263,7 +263,6 @@ EvosMovesPointerTable:
 	dw TaurosPEvosMoves
 	dw TaurosPAEvosMoves
 	dw TaurosPBEvosMoves
-	dw MissingNoEvosMoves
 	dw FossilKabutopsEvosMoves
 	dw FossilAerodactylEvosMoves
 	dw MonGhostEvosMoves
@@ -3279,12 +3278,6 @@ TaurosPBEvosMoves:
 	db 44, RAGE
 	db 51, FIRE_SPIN
 	db 0
-
-MissingNoEvosMoves:
-; Evolutions
-	db 0
-; Learnset
-	db 0
 	
 FossilKabutopsEvosMoves:
 ; Evolutions
diff --git a/data/pokemon/menu_icons.asm b/data/pokemon/menu_icons.asm
index 5550161f..7ab6f74c 100644
--- a/data/pokemon/menu_icons.asm
+++ b/data/pokemon/menu_icons.asm
@@ -251,4 +251,4 @@ MonPartyData:
 	nybble ICON_MON       ; Mew
 	nybble ICON_BALL      ; Meltan
 	nybble ICON_BALL      ; Melmetal
-	end_nybble_array NUM_POKEMON - 1
+	end_nybble_array NUM_POKEMON
diff --git a/data/pokemon/names.asm b/data/pokemon/names.asm
index e910cde9..5fe91a1f 100644
--- a/data/pokemon/names.asm
+++ b/data/pokemon/names.asm
@@ -254,6 +254,5 @@ MonsterNames::
 	db "MISSINGNO."
 	db "MISSINGNO."
 	db "MISSINGNO."
-	db "MISSINGNO."
 	
 	assert_table_length NUM_POKEMON_INDEXES
diff --git a/data/pokemon/palettes.asm b/data/pokemon/palettes.asm
index 2afcff65..f0fc90da 100644
--- a/data/pokemon/palettes.asm
+++ b/data/pokemon/palettes.asm
@@ -252,4 +252,4 @@ MonsterPalettes:
 	db PAL_MEWMON    ; MEW
 	db PAL_YELLOWMON ; MELTAN
 	db PAL_YELLOWMON ; MELMETAL
-	assert_table_length NUM_POKEMON
+	assert_table_length NUM_POKEMON + 1
diff --git a/data/wild/grass_water.asm b/data/wild/grass_water.asm
index afa760d0..219720a5 100644
--- a/data/wild/grass_water.asm
+++ b/data/wild/grass_water.asm
@@ -8,7 +8,7 @@ WildDataPointers:
 	dw NothingWildMons         ; VERMILION_CITY
 	dw NothingWildMons         ; CELADON_CITY
 	dw NothingWildMons         ; FUCHSIA_CITY
-	dw CinnabarWildMons        ; CINNABAR_ISLAND
+	dw NothingWildMons         ; CINNABAR_ISLAND
 	dw NothingWildMons         ; INDIGO_PLATEAU
 	dw NothingWildMons         ; SAFFRON_CITY
 	dw NothingWildMons         ; CITRINE_CITY
@@ -263,7 +263,6 @@ WildDataPointers:
         ; level, species (ten times)
 
 INCLUDE "data/wild/maps/nothing.asm"
-INCLUDE "data/wild/maps/CinnabarIsland.asm"
 INCLUDE "data/wild/maps/Route1.asm"
 INCLUDE "data/wild/maps/Route2.asm"
 INCLUDE "data/wild/maps/Route22.asm"
diff --git a/data/wild/maps/CinnabarIsland.asm b/data/wild/maps/CinnabarIsland.asm
deleted file mode 100644
index b4747a4b..00000000
--- a/data/wild/maps/CinnabarIsland.asm
+++ /dev/null
@@ -1,16 +0,0 @@
-CinnabarWildMons:	; This is used purely for testing MissingNo.
-	def_grass_wildmons 0 ; encounter rate
-	end_grass_wildmons
-
-	def_water_wildmons 20 ; encounter rate
-	db 80, MISSINGNO
-	db 80, MISSINGNO
-	db 80, MISSINGNO
-	db 80, MISSINGNO
-	db 80, MISSINGNO
-	db 80, MISSINGNO
-	db 80, MISSINGNO
-	db 80, MISSINGNO
-	db 80, MISSINGNO
-	db 80, MISSINGNO
-	end_water_wildmons
diff --git a/engine/events/give_pokemon.asm b/engine/events/give_pokemon.asm
index d6bce061..f2374e1e 100644
--- a/engine/events/give_pokemon.asm
+++ b/engine/events/give_pokemon.asm
@@ -57,8 +57,6 @@ SetPokedexOwnedFlag:
 	ld [wd11e], a
 	predef IndexToPokedex
 	ld a, [wd11e]
-	and a
-	ret z ; do nothing for missingno
 	dec a
 	ld c, a
 	ld hl, wPokedexOwned
diff --git a/engine/gfx/mon_icons.asm b/engine/gfx/mon_icons.asm
index 80ee40b6..3a7923ac 100644
--- a/engine/gfx/mon_icons.asm
+++ b/engine/gfx/mon_icons.asm
@@ -262,7 +262,6 @@ GetPartyMonSpriteID:
 	predef IndexToPokedex
 	ld a, [wd11e]
 	ld c, a
-	dec a
 	srl a
 	ld hl, MonPartyData
 	ld e, a
diff --git a/engine/items/item_effects.asm b/engine/items/item_effects.asm
index 37859d2f..099fa4c7 100644
--- a/engine/items/item_effects.asm
+++ b/engine/items/item_effects.asm
@@ -545,8 +545,6 @@ ItemUseBall:
 ; Add the caught Pokémon to the Pokédex.
 	predef IndexToPokedex
 	ld a, [wd11e]
-	and a ; is it missingno?
-	jr z, .skipShowingPokedexData ; don't mark in pokedex if so
 	dec a
 	ld c, a
 	ld b, FLAG_TEST
diff --git a/engine/pokemon/add_mon.asm b/engine/pokemon/add_mon.asm
index 2a117b64..94410edd 100644
--- a/engine/pokemon/add_mon.asm
+++ b/engine/pokemon/add_mon.asm
@@ -86,8 +86,6 @@ _AddPartyMon::
 	predef IndexToPokedex
 	pop de
 	ld a, [wd11e]
-	and a
-	jr z, .noMarkSeen ; if it's missingno don't do any pokedex actions
 	dec a
 	ld c, a
 	ld b, FLAG_TEST
@@ -104,7 +102,6 @@ _AddPartyMon::
 	pop bc
 	ld hl, wPokedexSeen
 	call FlagAction
-.noMarkSeen
 	pop hl
 	push hl
 
diff --git a/gfx/pics.asm b/gfx/pics.asm
index 35a875d6..7090e6c0 100644
--- a/gfx/pics.asm
+++ b/gfx/pics.asm
@@ -544,10 +544,8 @@ WugtrioPicFront::      INCBIN "gfx/pokemon/front/wugtrio.pic"
 WugtrioPicBack::       INCBIN "gfx/pokemon/back/wugtriob.pic"
 ToedscoolPicFront::      INCBIN "gfx/pokemon/front/toedscool.pic"
 ToedscoolPicBack::       INCBIN "gfx/pokemon/back/toedscoolb.pic"
-ToedscruelPicFront::      INCBIN "gfx/pokemon/front/toedscruel.pic"
-ToedscruelPicBack::       INCBIN "gfx/pokemon/back/toedscruelb.pic"
-MissingNoPicFront::    INCBIN "gfx/pokemon/front/missingno.pic"
-MissingNoPicBack::     INCBIN "gfx/pokemon/back/missingnob.pic"
+ToedscruelPicFront::     INCBIN "gfx/pokemon/front/toedscruel.pic"
+ToedscruelPicBack::      INCBIN "gfx/pokemon/back/toedscruelb.pic"
 
 SECTION "Pics 10", ROMX ; Extra Trainer Bank, currently storing regionals here too
 
diff --git a/home/pokemon.asm b/home/pokemon.asm
index 0462d5a4..c6f580c8 100644
--- a/home/pokemon.asm
+++ b/home/pokemon.asm
@@ -100,6 +100,7 @@ LoadFrontSpriteByMonIndex::
 	ld [hl], b
 	and a
 	pop hl
+	jr z, .invalidDexNumber ; dex #0 invalid
 	cp NUM_POKEMON + 1
 	jr c, .validDexNumber   ; dex numbers over normal limit invalid
 .invalidDexNumber
@@ -378,8 +379,6 @@ GetMonHeader::
 	jr z, .specialID
 	predef IndexToPokedex   ; convert pokemon ID in [wd11e] to pokedex number
 	ld a, [wd11e]
-	and a
-	jr z, .missingno ; index of 0 is missingno
 	dec a
 	ld bc, BASE_DATA_SIZE
 	ld hl, BaseStats
@@ -388,12 +387,6 @@ GetMonHeader::
 	ld bc, BASE_DATA_SIZE
 	call CopyData
 	jr .done
-.missingno
-	ld hl, MissingnoBaseStats
-	ld bc, BASE_DATA_SIZE
-	ld de, wMonHeader
-	call CopyData
-	jr .done
 .specialID
 	ld hl, wMonHSpriteDim
 	ld [hl], b ; write sprite dimensions
diff --git a/ram/wram.asm b/ram/wram.asm
index 5b6f0313..5a6181a1 100644
--- a/ram/wram.asm
+++ b/ram/wram.asm
@@ -1743,10 +1743,10 @@ SECTION "Main Data", WRAM0
 
 wMainDataStart::
 
-wPokedexOwned:: flag_array NUM_POKEMON - 1 ; discount MissingNo
+wPokedexOwned:: flag_array NUM_POKEMON
 wPokedexOwnedEnd::
 
-wPokedexSeen:: flag_array NUM_POKEMON - 1 ; discount MissingNo
+wPokedexSeen:: flag_array NUM_POKEMON
 wPokedexSeenEnd::
 
 ds 28 ;;;;;;; moved bag code lower down to make bigger bag space
diff --git a/scripts/CeladonMansion3F.asm b/scripts/CeladonMansion3F.asm
index 5f6278b5..566d7cf5 100644
--- a/scripts/CeladonMansion3F.asm
+++ b/scripts/CeladonMansion3F.asm
@@ -29,7 +29,7 @@ DirectorText:
 	ld b, wPokedexOwnedEnd - wPokedexOwned
 	call CountSetBits
 	ld a, [wNumSetBits]
-	cp NUM_POKEMON - 1
+	cp NUM_POKEMON
 	jr nc, .completed_dex
 	ld hl, .GameDesignerText
 	jr .done