Added config for Weak Armor's Gen 5-6 effect (#3498)

data/battle_scripts_1.s

@@ -9113,7 +9113,11 @@ BattleScript_WeakArmorDefAnim:
 	printstring STRINGID_TARGETABILITYSTATLOWER
 	waitmessage B_WAIT_TIME_LONG
 BattleScript_WeakArmorActivatesSpeed:
+.if B_WEAK_ARMOR_SPEED >= GEN_7
 	setstatchanger STAT_SPEED, 2, FALSE
+.else
+	setstatchanger STAT_SPEED, 1, FALSE
+.endif
 	statbuffchange STAT_CHANGE_ALLOW_PTR, BattleScript_WeakArmorActivatesEnd
 	jumpifbyte CMP_LESS_THAN, cMULTISTRING_CHOOSER, B_MSG_STAT_WONT_INCREASE, BattleScript_WeakArmorSpeedAnim
 	jumpifbyte CMP_EQUAL, cMULTISTRING_CHOOSER, B_MSG_STAT_ROSE_EMPTY, BattleScript_WeakArmorActivatesEnd

include/config/battle.h

@@ -129,6 +129,7 @@
 #define B_SNOW_WARNING              GEN_LATEST // In Gen9+, Snow Warning will summon snow instead of hail.
 #define B_TRANSISTOR_BOOST          GEN_LATEST // In Gen9+, Transistor will only boost Electric-type moves by 1.3x as opposed to 1.5x.
 #define B_ILLUMINATE_EFFECT         GEN_LATEST // In Gen9+, Illuminate prevents accuracy reductions and ignores the target's evasion.
+#define B_WEAK_ARMOR_SPEED          GEN_LATEST // In Gen7+, Weak Armor raises Speed by 2 stages instead of 1 when hit by a physical move.
 
 // Item settings
 #define B_HP_BERRIES                GEN_LATEST // In Gen4+, berries which restore HP activate immediately after HP drops to half. In Gen3, the effect occurs at the end of the turn.

test/battle/ability/weak_armor.c

@@ -7,6 +7,7 @@ ASSUMPTIONS
     ASSUME(gBattleMoves[MOVE_GUST].power != 0);
     ASSUME(gBattleMoves[MOVE_GUST].split == SPLIT_SPECIAL);
     ASSUME(gBattleMoves[MOVE_TACKLE].split == SPLIT_PHYSICAL);
+    ASSUME(B_WEAK_ARMOR_SPEED >= GEN_7);
 }
 
 SINGLE_BATTLE_TEST("Weak Armor lowers Defense by 1 and boosts Speed by 2 when hit by a physical attack")