Yujirou Enhancements

It felt weird that Koichi would have Gym Scaling, but Yujirou would not. So, I changed that to be a thing. I pegged his level scaling to Brock's, mainly because Normal-types are absolutely ballbustingly broken in this game and it makes sense from a progression standpoint. In doing that, I realised some variety in scaling (like, -1 +1, occasional 2 type stuff) could be interesting.

I also fixed multiple bugs;
- Gym Trainers correctly reset when you leave; no visible effect except to me debugging.
- Above also fixed Yujirou not having his loss sequence after, well, losing. Reported by shawesome.
- In fact, Yujirou will even display his loss text after losing, something I learned from doing Professor Oak's new Citrine Pass functionality.

engine/debug/debug_party.asm

@@ -57,9 +57,6 @@ IF DEF(_DEBUG)
 	ld a, GROWLITHE
 	ld [wBeautyChoice], a
 	
-	; Test Post-Game Functionality.
-	SetEvent EVENT_POST_GAME_ATTAINED
-	
 	; Get all badges except Earth Badge.
 	ld a, ~(1 << BIT_EARTHBADGE)
 	ld [wObtainedBadges], a
@@ -155,6 +152,9 @@ IF DEF(_DEBUG)
 	;ld hl, wPokedexSeen
 	;call DebugSetPokedexEntries
 	SetEvent EVENT_GOT_POKEDEX
+	
+	; Test Post-Game Functionality.
+	;SetEvent EVENT_POST_GAME_ATTAINED
 
 	; Rival chose Pikachu,
 	; Player chose Eevee.