Myriad of changes!

This is a pretty hefty commit, so let's break it down.
- Fixes Pokedex entries for Bittybat, Bulbasaur, and Shellder.
- ...presumably fixes the options menu.
- Adds a Fishing Group and water wild data to Diglett's Cave, also reduces the encounter rate. More to come.
- Modifies parties, including evolving Rival 2's starter.
- Attempts to fix the Ultra and Safari Balls by making `BallFactor` 4, which appears to be the intended number. Tests yielded positive results.
- Restores a ton of Japanese references that got removed in localisation, including some errors.

engine/items/item_effects.asm

@@ -275,6 +275,10 @@ ItemUseBall:
 	ld a, [wcf91]
 	cp GREAT_BALL
 	ld a, 12
+	cp ULTRA_BALL ; lower threshold for ultras and safaris fix
+	ld a, 4
+	cp SAFARI_BALL 
+	ld a, 4 ; fix ends here
 	jr nz, .skip1
 	ld a, 8