From 6078cd3e15362fe99fdb42db2559fb39af3e4ffe Mon Sep 17 00:00:00 2001
From: Eduardo Alvaro Quezada D'Ottone <eduardo602002@gmail.com>
Date: Sat, 11 Apr 2020 06:24:25 -0400
Subject: [PATCH] Anticipation ability (#282)

---
 data/battle_scripts_1.s  |  7 +++++++
 include/battle_scripts.h |  1 +
 src/battle_message.c     |  5 +++--
 src/battle_util.c        | 43 ++++++++++++++++++++++++++++++++++++++++
 4 files changed, 54 insertions(+), 2 deletions(-)

diff --git a/data/battle_scripts_1.s b/data/battle_scripts_1.s
index 994679d837..2d0a530444 100644
--- a/data/battle_scripts_1.s
+++ b/data/battle_scripts_1.s
@@ -5880,6 +5880,13 @@ BattleScript_IllusionOff::
 	waitmessage 0x40
 	return
 
+BattleScript_AnticipationActivates::
+	pause 0x5
+	call BattleScript_AbilityPopUp
+	printstring STRINGID_ANTICIPATIONACTIVATES
+	waitmessage 0x40
+	return
+
 BattleScript_AftermathDmg::
 	pause 0x20
 	call BattleScript_AbilityPopUp
diff --git a/include/battle_scripts.h b/include/battle_scripts.h
index 93f4e3b099..f30cec0255 100644
--- a/include/battle_scripts.h
+++ b/include/battle_scripts.h
@@ -330,5 +330,6 @@ extern const u8 BattleScript_DancerActivates[];
 extern const u8 BattleScript_AftermathDmg[];
 extern const u8 BattleScript_StanceChangeActivates[];
 extern const u8 BattleScript_DisguiseBustedActivates[];
+extern const u8 BattleScript_AnticipationActivates[];
 
 #endif // GUARD_BATTLE_SCRIPTS_H
diff --git a/src/battle_message.c b/src/battle_message.c
index bd2b64b60a..13d8a82c89 100644
--- a/src/battle_message.c
+++ b/src/battle_message.c
@@ -587,7 +587,7 @@ static const u8 sText_SlowStartEnters[] = _("{B_ATK_NAME_WITH_PREFIX} can't get
 static const u8 sText_SlowStartEnd[] = _("{B_ATK_NAME_WITH_PREFIX} finally got its act together!");
 static const u8 sText_SolarPowerHpDrop[] = _("The {B_ATK_NAME_WITH_PREFIX}'s {B_ATK_ABILITY}\ntakes its toll!");
 static const u8 sText_AftermathDmg[] = _("{B_ATK_NAME_WITH_PREFIX} is hurt!");
-static const u8 sText_AnticipationActivates[] = _("The {B_ATK_NAME_WITH_PREFIX} shuddered in {B_ATK_ABILITY}!");
+static const u8 sText_AnticipationActivates[] = _("The {B_ATK_NAME_WITH_PREFIX} shuddered\nin anticipation!");
 static const u8 sText_ForewarnActivates[] = _("{B_ATK_ABILITY} alerted the {B_ATK_NAME_WITH_PREFIX} to the\n{B_DEF_NAME_WITH_PREFIX}'s {B_BUFF1}!");
 static const u8 sText_IceBodyHpGain[] = _("{B_ATK_NAME_WITH_PREFIX}'s {B_ATK_ABILITY}\nhealed it a little bit!");
 static const u8 sText_SnowWarningHail[] = _("It started to hail!");
@@ -1220,7 +1220,8 @@ const u16 gDmgHazardsStringIds[] =
 
 const u16 gSwitchInAbilityStringIds[] =
 {
-    STRINGID_MOLDBREAKERENTERS, STRINGID_TERAVOLTENTERS, STRINGID_TURBOBLAZEENTERS, STRINGID_SLOWSTARTENTERS, STRINGID_UNNERVEENTERS
+    STRINGID_MOLDBREAKERENTERS, STRINGID_TERAVOLTENTERS, STRINGID_TURBOBLAZEENTERS,
+    STRINGID_SLOWSTARTENTERS, STRINGID_UNNERVEENTERS, STRINGID_ANTICIPATIONACTIVATES
 };
 
 const u16 gMissStringIds[] =
diff --git a/src/battle_util.c b/src/battle_util.c
index ea46e3fd49..a1567bc814 100644
--- a/src/battle_util.c
+++ b/src/battle_util.c
@@ -2863,6 +2863,49 @@ u8 AbilityBattleEffects(u8 caseID, u8 battler, u8 ability, u8 special, u16 moveA
                 effect++;
             }
             break;
+        case ABILITY_ANTICIPATION:
+            {
+                bool16 shudders = FALSE;
+                u8 side = (GetBattlerPosition(battler) ^ BIT_SIDE) & BIT_SIDE; // side of the opposing pokemon
+                u8 target1 = GetBattlerAtPosition(side);
+                u8 target2 = GetBattlerAtPosition(side + BIT_FLANK);
+                
+                if (IsBattlerAlive(target1))
+                {
+                    for(i = 0; i < MAX_MON_MOVES; i++)
+                    {
+                        move = gBattleMons[target1].moves[i];
+                        GET_MOVE_TYPE(move, moveType);
+                        if(CalcTypeEffectivenessMultiplier(move, moveType, target1, battler, FALSE) >= UQ_4_12(2.0))
+                        {
+                            shudders = TRUE;
+                            break;
+                        }
+                    }
+                }
+
+                if (gBattleTypeFlags & BATTLE_TYPE_DOUBLE && IsBattlerAlive(target2))
+                {
+                    for(i = 0; i < MAX_MON_MOVES; i++)
+                    {
+                        move = gBattleMons[target2].moves[i];
+                        GET_MOVE_TYPE(move, moveType);
+                        if(CalcTypeEffectivenessMultiplier(move, moveType, target2, battler, FALSE) >= UQ_4_12(2.0))
+                        {
+                            shudders = TRUE;
+                            break;
+                        }
+                    }
+                }
+                if (!gSpecialStatuses[battler].switchInAbilityDone && shudders)
+                {
+                    gBattleCommunication[MULTISTRING_CHOOSER] = 5;
+                    gSpecialStatuses[battler].switchInAbilityDone = 1;
+                    BattleScriptPushCursorAndCallback(BattleScript_SwitchInAbilityMsg);
+                    effect++;
+                }
+            }
+            break;
         case ABILITY_DOWNLOAD:
             if (!gSpecialStatuses[battler].switchInAbilityDone)
             {