allow ai vs ai battles

asm/macros/event.inc

@@ -2018,3 +2018,10 @@
 	setvar VAR_0x8002, \tryMultiple
 	special TrySpecialOverworldEvo
 	.endm
+	
+	.macro ai_vs_ai_battle trainer1:req, trainer2:req
+	setflag B_FLAG_AI_VS_AI_BATTLE
+	setvar VAR_0x8004, trainer1
+	callnative CreateTrainerPartyForPlayer
+	trainerbattle_no_intro trainer2, NULL
+	.endm

include/config/battle.h

@@ -156,6 +156,7 @@
 #define B_SMART_WILD_AI_FLAG        0     // If not 0, you can set this flag in a script to enable smart wild pokemon
 #define B_FLAG_NO_BAG_USE           0     // If this flag is set, the ability to use the bag in battle is disabled.
 #define B_FLAG_NO_CATCHING          0     // If this flag is set, the ability to catch wild Pokémon is disabled.
+#define B_FLAG_AI_VS_AI_BATTLE      0     // If this flag is set, the player's mons will be controlled by the ai next battles.
 
 // Var Settings
 // To use the following features in scripting, replace the 0s with the var ID you're assigning it to.

src/battle_ai_util.c

@@ -8,6 +8,7 @@
 #include "battle_ai_switch_items.h"
 #include "battle_factory.h"
 #include "battle_setup.h"
+#include "event_data.h"
 #include "data.h"
 #include "item.h"
 #include "pokemon.h"
@@ -445,6 +446,8 @@ bool32 BattlerHasAi(u32 battlerId)
     switch (GetBattlerPosition(battlerId))
     {
     case B_POSITION_PLAYER_LEFT:
+        if (FlagGet(B_FLAG_AI_VS_AI_BATTLE))
+            return TRUE;
     default:
         return FALSE;
     case B_POSITION_OPPONENT_LEFT:

src/battle_controllers.c

@@ -6,6 +6,7 @@
 #include "battle_message.h"
 #include "battle_setup.h"
 #include "cable_club.h"
+#include "event_data.h"
 #include "link.h"
 #include "link_rfu.h"
 #include "party_menu.h"
@@ -170,6 +171,8 @@ static void InitSinglePlayerBtlControllers(void)
             gBattlerControllerFuncs[0] = SetControllerToSafari;
         else if (gBattleTypeFlags & BATTLE_TYPE_WALLY_TUTORIAL)
             gBattlerControllerFuncs[0] = SetControllerToWally;
+        else if (FlagGet(B_FLAG_AI_VS_AI_BATTLE))
+            gBattlerControllerFuncs[0] = SetControllerToPlayerPartner;
         else
             gBattlerControllerFuncs[0] = SetControllerToPlayer;
 
@@ -221,13 +224,19 @@ static void InitSinglePlayerBtlControllers(void)
     {
         gBattleMainFunc = BeginBattleIntro;
 
-        gBattlerControllerFuncs[0] = SetControllerToPlayer;
+        if (FlagGet(B_FLAG_AI_VS_AI_BATTLE))
+            gBattlerControllerFuncs[0] = SetControllerToPlayerPartner;
+        else
+            gBattlerControllerFuncs[0] = SetControllerToPlayer;
         gBattlerPositions[0] = B_POSITION_PLAYER_LEFT;
 
         gBattlerControllerFuncs[1] = SetControllerToOpponent;
         gBattlerPositions[1] = B_POSITION_OPPONENT_LEFT;
 
-        gBattlerControllerFuncs[2] = SetControllerToPlayer;
+        if (FlagGet(B_FLAG_AI_VS_AI_BATTLE))
+            gBattlerControllerFuncs[2] = SetControllerToPlayerPartner;
+        else
+            gBattlerControllerFuncs[2] = SetControllerToPlayer;
         gBattlerPositions[2] = B_POSITION_PLAYER_RIGHT;
 
         gBattlerControllerFuncs[3] = SetControllerToOpponent;

src/battle_main.c

@@ -565,8 +565,8 @@ static void CB2_InitBattleInternal(void)
     gBattle_BG3_X = 0;
     gBattle_BG3_Y = 0;
 
-#if DEBUG_OVERWORLD_MENU == FALSE 
+#if DEBUG_OVERWORLD_MENU == FALSE
-    
+
     gBattleTerrain = BattleSetup_GetTerrainId();
 #else
     if (!gIsDebugBattle)
@@ -594,7 +594,7 @@ static void CB2_InitBattleInternal(void)
     else
         SetMainCallback2(CB2_HandleStartBattle);
 
-#if DEBUG_OVERWORLD_MENU == FALSE 
+#if DEBUG_OVERWORLD_MENU == FALSE
     if (!(gBattleTypeFlags & (BATTLE_TYPE_LINK | BATTLE_TYPE_RECORDED)))
     {
         CreateNPCTrainerParty(&gEnemyParty[0], gTrainerBattleOpponent_A, TRUE);
@@ -2145,6 +2145,12 @@ static u8 CreateNPCTrainerParty(struct Pokemon *party, u16 trainerNum, bool8 fir
     return retVal;
 }
 
+void CreateTrainerPartyForPlayer(void)
+{
+    ZeroPlayerPartyMons();
+    CreateNPCTrainerPartyFromTrainer(gPlayerParty, &gTrainers[gSpecialVar_0x8004], TRUE, 0);
+}
+
 void VBlankCB_Battle(void)
 {
     // Change gRngSeed every vblank unless the battle could be recorded.