Fix a bunch of single player battle engine bugs

went through a bunch of the tutorials here;
https://github.com/pret/pokered/wiki/Bugs-and-Glitches#blaine-uses-super-potion-even-when-his-pok%C3%A9mon-arent-below-10-health

Overall:
- Blaine is no longer addicted to Super Potions
- CoolTrainerF no longer switches a lot
- Transformed Pokemon aren't presumed to be Dittos (very important given Animon)
- Status curing items don't remove modifiers anymore
- Learning new moves plays the sound in the correct bank

engine/battle/trainer_ai.asm

@@ -345,7 +345,7 @@ CooltrainerFAI:
 	; The intended 25% chance to consider switching will not apply.
 	; Uncomment the line below to fix this.
 	cp 25 percent + 1
-	; ret nc
+	ret nc ; fixes the bug
 	ld a, 10
 	call AICheckIfHPBelowFraction
 	jp c, AIUseHyperPotion
@@ -387,6 +387,9 @@ KogaAI:
 BlaineAI:
 	cp 25 percent + 1
 	ret nc
+	ld a, 10
+	call AICheckIfHPBelowFraction
+	ret nc ; this fixes the super potion thing - PvK
 	jp AIUseSuperPotion
 
 SabrinaAI:

engine/items/item_effects.asm

@@ -473,9 +473,7 @@ ItemUseBall:
 ; Mirror Move even though the only wild Pokémon that knows Transform is Ditto.
 	ld hl, wEnemyBattleStatus3
 	bit TRANSFORMED, [hl]
-	jr z, .notTransformed
-	ld a, DITTO
-	ld [wEnemyMonSpecies2], a
+	jr z, .notTransformed ; removed lines that cause above bug - PvK
 	jr .skip6
 
 .notTransformed
@@ -909,7 +907,10 @@ ItemUseMedicine:
 	ld de, wBattleMonStats
 	ld bc, NUM_STATS * 2
 	call CopyData ; copy party stats to in-battle stat data
-	predef DoubleOrHalveSelectedStats
+	xor a
+	ld [wCalculateWhoseStats], a
+	callfar CalculateModifiedStats
+	callfar ApplyBadgeStatBoosts
 	jp .doneHealing
 .healHP
 	inc hl ; hl = address of current HP

engine/pokemon/learn_move.asm

@@ -205,12 +205,38 @@ TryingToLearnText:
 	text_far _TryingToLearnText
 	text_end
 
-OneTwoAndText:
+OneTwoAndText: ; uses the fixed move swap sound - PvK
 	text_far _OneTwoAndText
 	text_pause
 	text_asm
+	text_far _OneTwoAndText
+	text_pause
+	text_asm
+	push af
+	push bc
+	push de
+	push hl
+	ld a, $1
+	ld [wMuteAudioAndPauseMusic], a
+	call DelayFrame
+	ld a, [wAudioROMBank]
+	push af
+	ld a, BANK(SFX_Swap_1)
+	ld [wAudioROMBank], a
+	ld [wAudioSavedROMBank], a
+	call WaitForSoundToFinish
 	ld a, SFX_SWAP
-	call PlaySoundWaitForCurrent
+	call PlaySound
+	call WaitForSoundToFinish
+	pop af
+	ld [wAudioROMBank], a
+	ld [wAudioSavedROMBank], a
+	xor a
+	ld [wMuteAudioAndPauseMusic], a
+	pop hl
+	pop de
+	pop bc
+	pop af
 	ld hl, PoofText
 	ret