Add Powder Snow, fix Moltres

- Adds Powder Snow; GSC stats, was cut from RBY.
- Articuno, Jynx, Buu, Glaceon, Alolan Sandslash, and Alolan Ninetales get Powder Snow at L1.
- Glaceon also gets Powder Snow over Aurora Beam at L1; a nerf that makes it more accurate to its PLA learnset. Glaceon doesn't normally get this move.
- Moltres now gets Flamethrower at L51, fixing an error that GSC fixed. Leer is off by exactly 10 spaces. Leer has been made an L1 move, making it consistent with Articuno's Powder Snow. Does not affect legality, given the Tradeback Tutor.
- Because I'm pedantic, Zapdos gets Thunderbolt as an L1 move like Articuno's Ice Beam, so they all stay the same. Does not affect legality.

data/moves/animations.asm

@@ -185,6 +185,7 @@ AttackAnimationPointers:
 	dw DisarmingVoiceAnim
 	dw NastyPlotAnim
 	dw UppercutAnim
+	dw PowderSnowAnim
 	dw StruggleAnim
 	assert_table_length NUM_ATTACKS
 	dw ShowPicAnim
@@ -565,6 +566,11 @@ IceBeamAnim:
 	battle_anim NO_MOVE, SUBANIM_0_ICE_RISE, 0, 16
 	db -1 ; end
 
+PowderSnowAnim:
+	battle_anim BLIZZARD, SUBANIM_0_CIRCLES_FALLING, 0, 6
+	battle_anim NO_MOVE, SUBANIM_0_ICE_RISE, 0, 16
+	db -1 ; end
+
 BlizzardAnim:
 	battle_anim NO_MOVE, SE_DARK_SCREEN_PALETTE
 	battle_anim BLIZZARD, SUBANIM_0_ICE_FALL, 0, 4

data/moves/moves.asm

@@ -196,5 +196,6 @@ Moves:
 	move DISARMING_VOICE, SWIFT_EFFECT,             40, FAIRY,        100, 10
 	move NASTY_PLOT,      SPECIAL_UP2_EFFECT,        0, DARK,         100, 10
 	move UPPERCUT,     FLINCH_SIDE_EFFECT2,         55, FIGHTING,      80, 15
+	move POWDER_SNOW,     FREEZE_SIDE_EFFECT,         40, ICE,      100, 25
 	move STRUGGLE,        RECOIL_EFFECT,            50, NORMAL,       100, 10
 	assert_table_length NUM_ATTACKS

data/moves/names.asm

@@ -185,5 +185,6 @@ MoveNames:: ; 12chr limit
 	li "DISARMVOICE"
 	li "NASTY PLOT"
 	li "UPPERCUT"
+	li "POWDER SNOW"
 	li "STRUGGLE"
 	assert_list_length NUM_ATTACKS

data/moves/sfx.asm

@@ -186,6 +186,7 @@ MoveSoundTable:
 	db SFX_BATTLE_37,          $10, $60 ; DISARMING_VOICE
 	db SFX_BATTLE_09,          $e8, $10 ; NASTY_PLOT
 	db SFX_SUPER_EFFECTIVE,    $00, $e0 ; UPPERCUT
+	db SFX_BATTLE_28,          $40, $80 ; POWDER_SNOW
 	db SFX_BATTLE_0B,          $00, $80 ; STRUGGLE
 	assert_table_length NUM_ATTACKS