First Commit

Upload literally everything from the pokecrystal16 expand-move-ID branch

engine/battle/move_effects/frustration.asm

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+BattleCommand_FrustrationPower:
+; BUG: Return and Frustration deal no damage when the user's happiness is low or high, respectively (see docs/bugs_and_glitches.md)
+	push bc
+	ld hl, wBattleMonHappiness
+	ldh a, [hBattleTurn]
+	and a
+	jr z, .ok
+	ld hl, wEnemyMonHappiness
+.ok
+	ld a, $ff
+	sub [hl]
+	ldh [hMultiplicand + 2], a
+	xor a
+	ldh [hMultiplicand + 0], a
+	ldh [hMultiplicand + 1], a
+	ld a, 10
+	ldh [hMultiplier], a
+	call Multiply
+	ld a, 25
+	ldh [hDivisor], a
+	ld b, 4
+	call Divide
+	ldh a, [hQuotient + 3]
+	ld d, a
+	pop bc
+	ret