Fixes intimidate missing timing during a mega evo / switch (#6322)

Co-authored-by: Bassoonian <iasperbassoonian@gmail.com>

src/battle_main.c

@@ -3259,6 +3259,9 @@ void SwitchInClearSetData(u32 battler)
     gCurrentMove = MOVE_NONE;
     gBattleStruct->arenaTurnCounter = 0xFF;
 
+    // Restore struct member so replacement does not miss timing
+    gSpecialStatuses[battler].switchInAbilityDone = FALSE;
+
     // Reset damage to prevent things like red card activating if the switched-in mon is holding it
     gSpecialStatuses[battler].physicalDmg = 0;
     gSpecialStatuses[battler].specialDmg = 0;

test/battle/ability/intimidate.c

@@ -375,3 +375,18 @@ DOUBLE_BATTLE_TEST("Intimidate will correctly decrease the attack of the second
         ANIMATION(ANIM_TYPE_GENERAL, B_ANIM_STATS_CHANGE, playerRight);
     }
 }
+
+SINGLE_BATTLE_TEST("Intimdate does not lose timing after mega evolution and switch out by a hit escape move")
+{
+    GIVEN {
+        ASSUME(gMovesInfo[MOVE_U_TURN].effect == EFFECT_HIT_ESCAPE);
+        PLAYER(SPECIES_WOBBUFFET);
+        OPPONENT(SPECIES_MANECTRIC) { Item(ITEM_MANECTITE); }
+        OPPONENT(SPECIES_ARBOK) { Ability(ABILITY_INTIMIDATE); }
+    } WHEN {
+        TURN { MOVE(opponent, MOVE_U_TURN, gimmick: GIMMICK_MEGA); SEND_OUT(opponent, 1); }
+    } SCENE {
+        ABILITY_POPUP(opponent, ABILITY_INTIMIDATE);
+        ABILITY_POPUP(opponent, ABILITY_INTIMIDATE);
+    }
+}