LOTS of things

- Replaces the Old Rod with the Candy Sack, an item to evolve Meltan into Melmetal. Meltan and Melmetal aren't in yet.
- Improves Gym Leader and Elite Four AI by a lot. They still use items, they're just better. Fixes XSpecial use while we're at it; before, it didn't actually increase the stat...
- The Scarlet Book now takes up both shelves, one section for each Paradox Pokemon. I also moved the bookshelf so it looks nicer.
- Text in Celadon University has been reduced significantly, taking up less memory and being a bit more RBY-like. It has also been made more accurate (thanks to Daiginjo for translating my booklet!)
- The Magikarp researcher in Celadon University now gives TM Dragon Rage (no longer unused!)
- Added a guard for Mt. Moon Crater.
- Removed TrainerNamePointers, Blank Leader Name Code, and Dakutens/Hakutens using a guide published by YakiNeen.
- PP no longer uses a shitty graphic and is instead properly implemented into the font, optimising the status screen. Also displays in-battle which is kinda cool.
- Lorelei, Bruno, and Agatha now play the Gym Leader theme, not just Lance.

Still unsure how to fix Celadon University's trainers, all I know is a lot of the information should be taken from the Oak fight I did. The code is radically different and doesn't call trainer headers at all. You'll likely want to start from scratch.

The Mt. Moon Crater Guard's text is a little wonky, not sure what's up there. May have been from the way I accessed Mt. Moon in testing. Anyway, if you want to mess around feel free.

data/items/key_items.asm

@@ -75,7 +75,7 @@ KeyItemFlags:
 	dbit TRUE  ; POKE_FLUTE
 	dbit TRUE  ; LIFT_KEY
 	dbit FALSE ; EXP_ALL
-	dbit TRUE  ; OLD_ROD
+	dbit FALSE  ; was TRUE for OLD_ROD, now CANDY_SACK
 	dbit TRUE  ; GOOD_ROD
 	dbit TRUE  ; SUPER_ROD
 	dbit FALSE ; PP_UP

data/items/names.asm

@@ -75,7 +75,7 @@ ItemNames::
 	li "POKé FLUTE"
 	li "LIFT KEY"
 	li "EXP.ALL"
-	li "OLD ROD"
+	li "CANDY SACK" ; was old rod
 	li "GOOD ROD"
 	li "FISHING ROD"
 	li "PP UP"

data/items/prices.asm

@@ -75,7 +75,7 @@ ItemPrices::
 	bcd3 0     ; POKE_FLUTE
 	bcd3 0     ; LIFT_KEY
 	bcd3 0     ; EXP_ALL
-	bcd3 0     ; OLD_ROD
+	bcd3 0     ; was OLD_ROD, now CANDY_SACK. Plan to be one-of-a-kind, so 0 to discourage sale a la Master Ball.
 	bcd3 0     ; GOOD_ROD
 	bcd3 0     ; SUPER_ROD
 	bcd3 0     ; PP_UP

data/items/use_overworld.asm

@@ -3,7 +3,7 @@ UsableItems_CloseMenu:
 	db ESCAPE_ROPE
 	db ITEMFINDER
 	db POKE_FLUTE
-	db OLD_ROD
+	;db OLD_ROD no longer exists
 	db GOOD_ROD
 	db SUPER_ROD
 	db -1 ; end

data/items/use_party.asm

@@ -32,6 +32,7 @@ UsableItems_PartyMenu:
 	db X_DEFEND
 	db X_SPEED
 	db X_SPECIAL
+	db CANDY_SACK
 	db PP_UP
 	db ETHER
 	db MAX_ETHER