Bill's Garden, add Rowan NPC

Rowan NPC added to Cinnabar Lab, just a little cute thing.

Bill's Garden could see many revisions, what's here is the bare minimum. Here's what's done:
- Nidorino NPC blocks it off and is unlocked in the post-game. This currently contradicts the myth - I have a plan for this soon.
- Wild Pokemon are the "non-reproducibles" given in Stadium; starters and eevee are mandatory given those were common in the myth
- Hisui forms should be added when possible
- I had to remake Martha's map in the forest tileset so leaving would be possible
- Everything is at a point where it functions

data/maps/headers/BillsGarden.asm

@@ -0,0 +1,2 @@
+	map_header BillsGarden, BILLS_GARDEN, FOREST, 0
+	end_map_header

data/maps/hide_show_data.asm

@@ -247,7 +247,7 @@ MapHSPointers:
 	dw NoHS
 	dw NoHS
 	dw NoHS
-	dw UnusedMapF4HS
+	dw BillsGardenHS
 	dw NoHS
 	dw NoHS
 	dw NoHS
@@ -397,6 +397,7 @@ BillsHouseHS:
 	db BILLS_HOUSE, $01, SHOW
 	db BILLS_HOUSE, $02, HIDE
 	db BILLS_HOUSE, $03, HIDE
+	db BILLS_HOUSE, $04, SHOW
 ViridianForestHS:
 	db VIRIDIAN_FOREST, $05, SHOW
 	db VIRIDIAN_FOREST, $06, SHOW
@@ -507,8 +508,8 @@ SilphCo11FHS:
 	db SILPH_CO_11F, $03, SHOW
 	db SILPH_CO_11F, $04, SHOW
 	db SILPH_CO_11F, $05, SHOW
-UnusedMapF4HS:
-	db UNUSED_MAP_F4, $02, SHOW
+BillsGardenHS: ; could be used for the dragonite boss fight, so not removing this part of UNUSED_MAP_F4
+	db BILLS_GARDEN, $02, SHOW
 CinnabarVolcanoHS:
 	db CINNABAR_VOLCANO, $01, SHOW
 PokemonMansion2FHS:

data/maps/map_header_banks.asm

@@ -245,7 +245,7 @@ MapHeaderBanks::
 	db BANK(CeladonUniversityOutside_h) ; $11 UNUSED_MAP_F1
 	db BANK(CeladonUniversityInside_h) ; $11 UNUSED_MAP_F2
 	db BANK(CeladonUniversityPokecenter_h) ; UNUSED_MAP_F3
-	db $11 ; UNUSED_MAP_F4
+	db BANK(BillsGarden_h) ; UNUSED_MAP_F4, $11
 	db BANK(LoreleisRoom_h)
 	db BANK(BrunosRoom_h)
 	db BANK(AgathasRoom_h)

data/maps/map_header_pointers.asm

@@ -245,7 +245,7 @@ MapHeaderPointers::
 	dw CeladonUniversityOutside_h ; UNUSED_MAP_F1
 	dw CeladonUniversityInside_h ; UNUSED_MAP_F2
 	dw CeladonUniversityPokecenter_h ; UNUSED_MAP_F3
-	dw SilphCo2F_h ; UNUSED_MAP_F4
+	dw BillsGarden_h ; UNUSED_MAP_F4, used to use SilphCo2F_h
 	dw LoreleisRoom_h
 	dw BrunosRoom_h
 	dw AgathasRoom_h

data/maps/objects/BillsGarden.asm

@@ -0,0 +1,12 @@
+BillsGarden_Object:
+	db $03 ; border block
+
+	def_warp_events
+	warp_event  6, 17, BILLS_HOUSE, 1
+	warp_event  7, 17, BILLS_HOUSE, 1
+
+	def_bg_events
+
+	def_object_events
+
+	def_warps_to BILLS_GARDEN

data/maps/objects/BillsHouse.asm

@@ -2,8 +2,9 @@ BillsHouse_Object:
 	db $d ; border block
 
 	def_warp_events
-	warp_event  2,  7, LAST_MAP, 1
-	warp_event  3,  7, LAST_MAP, 1
+	warp_event  2,  9, LAST_MAP, 1
+	warp_event  3,  9, LAST_MAP, 1
+	warp_event 11,  0, BILLS_GARDEN, 1
 
 	def_bg_events
 
@@ -11,5 +12,6 @@ BillsHouse_Object:
 	object_event  6,  5, SPRITE_MONSTER, STAY, NONE, 1 ; person
 	object_event  4,  4, SPRITE_SUPER_NERD, STAY, NONE, 2 ; person
 	object_event  6,  5, SPRITE_SUPER_NERD, STAY, NONE, 3 ; person
+	object_event 11,  1, SPRITE_MONSTER, STAY, NONE, 4 ; nidorino
 
 	def_warps_to BILLS_HOUSE

data/maps/objects/CinnabarLab.asm

@@ -16,5 +16,6 @@ CinnabarLab_Object:
 
 	def_object_events
 	object_event  1,  3, SPRITE_FISHING_GURU, STAY, NONE, 1 ; person
+	object_event 11,  6, SPRITE_SCIENTIST, WALK, ANY_DIR, 2 ; person
 
 	def_warps_to CINNABAR_LAB

data/wild/maps/BillsGarden.asm

@@ -0,0 +1,26 @@
+BillsGardenWildMons: ; wild mons are definitely edit-able
+	def_grass_wildmons 10 ; encounter rate
+	db 46, EEVEE
+	db 46, EEVEE
+	db 46, CHARMANDER
+	db 49, BULBASAUR
+	db 49, HITMONTOP
+	db 52, HITMONCHAN
+	db 49, HITMONLEE
+	db 52, KABUTO
+	db 53, OMANYTE
+	db 53, AERODACTYL
+	end_grass_wildmons
+
+	def_water_wildmons 10 ; encounter rate
+	db 40, SQUIRTLE
+	db 40, SQUIRTLE
+	db 40, SQUIRTLE
+	db 40, SQUIRTLE
+	db 40, SQUIRTLE
+	db 40, SQUIRTLE
+	db 40, SQUIRTLE
+	db 40, BLASTOISE
+	db 40, BLASTOISE
+	db 40, TOTARTLE
+	end_water_wildmons