Gym Leader Rematches!

This commit adds a large fundamental change to KEP, that being Gym Rematches.

This is achieved alongside a rework to the script that makes those post-game-gating NPCs shift around. If you add a new one, just add its constant to the lists you'll see in the Hall of Fame script.

It also fixes a few bugs:
- Fixed a bug where Cinnabar Gym loaded a fleet of Blaines. This occurred due to the way he is coded at base, and a misunderstanding I had when implementing his scaling. This is now fixed by standardising his gym script instead, while letting the gym trainers still use the old one.
- Fixed a bug where the Up-Grade NPC would not appear after beating Silph Co. 11F. However, Giovanni currently seems to have trouble with his text. This floor needs some re-coding anyway, given we need to add Jessie and James to it.

And some misc. changes:
- Changed the first Moon Stone in Mt. Moon to a Poison Stone for the Nidoking speedrunners
- Debug Mode now has a line of code to set up the post-game easily
- Changed Surge's initial battle text to Yellow's
- Added Sabrina's more accurate LGPE initial battle text, referring to the spoon she bent by accident

text/PewterGym_2.asm

@@ -144,3 +144,27 @@ _PewterGymGuidePostBattleText::
 	line "You're #MON"
 	cont "champ material!"
 	done
+
+_BrockRematchDefeatedText::
+	text "I knew"
+	line "you were strong,"
+	cont "but this..."
+	prompt
+
+_BrockRematchPostText::
+	text "I've chosen to"
+	line "postpone my"
+	cont "dream of being"
+	cont "a #MON"
+	cont "breeder for a"
+	cont "little longer."
+	
+	para "Right now, I'm"
+	line "more interested"
+	cont "training to one"
+	cont "day defeat you!"
+	
+	para "Battle me again"
+	line "sometime!"
+	done
+