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[Script] Specials That Change Trainer Attributes

dGxx

    • 124
    Posts
    8
    Years
    • Seen Apr 5, 2024
    I wanted to make a stadium area where you are given the choice to battle trainers in either single or double battles, but I see I have to define both trainers, one for single and one for double, but that would take a lot of additional trainer slots.

    So I was wondering if there were any specials or any other commands that can make a battle double even if its only defined as single.

    If there aren't any, how would a special like that be written so I could make my own? Any existing commands or specials that already edit a trainer's attribute that was already defined?
     
    Lunos

    Lunos

    Random Uruguayan User
    • 3,116
    Posts
    15
    Years
    No, there aren't any such specials.
    I don't think a special is what you'd want to use here anyway.
    If I were you, I'd just use a flag and make the relevant tweaks to CreateNPCTrainerParty, the function that fills gEnemyParty with a trainer's party data before a trainer battle starts.
    Ex:
    Code: 
    diff --git a/include/constants/flags.h b/include/constants/flags.h
index 8d98e3aa0..53d548930 100644
--- a/include/constants/flags.h
+++ b/include/constants/flags.h
@@ -42,7 +42,7 @@
 #define TEMP_FLAGS_END   FLAG_TEMP_1F
 #define NUM_TEMP_FLAGS   (TEMP_FLAGS_END - TEMP_FLAGS_START + 1)
 
[color=red]-#define FLAG_UNUSED_0x020    0x20 // Unused Flag[/color]
[color=seagreen]+#define FLAG_FORCE_DOUBLE_TRAINER_BATTLES    0x20 // Originally Unused Flag[/color]
 #define FLAG_UNUSED_0x021    0x21 // Unused Flag
 #define FLAG_UNUSED_0x022    0x22 // Unused Flag
 #define FLAG_UNUSED_0x023    0x23 // Unused Flag
diff --git a/src/battle_main.c b/src/battle_main.c
index c19089deb..5bc17dadf 100644
--- a/src/battle_main.c
+++ b/src/battle_main.c
@@ -1962,6 +1962,7 @@ static u8 CreateNPCTrainerParty(struct Pokemon *party, u16 trainerNum, bool8 fir
     u8 fixedIV;
     s32 i, j;
     u8 monsCount;
[color=seagreen]+    bool8 isDoubleBattle = gTrainers[trainerNum].doubleBattle;[/color]
 
     if (trainerNum == TRAINER_SECRET_BASE)
         return 0;
@@ -1985,10 +1986,13 @@ static u8 CreateNPCTrainerParty(struct Pokemon *party, u16 trainerNum, bool8 fir
             monsCount = gTrainers[trainerNum].partySize;
         }
 
[color=seagreen]+        if (FlagGet(FLAG_FORCE_DOUBLE_TRAINER_BATTLES) && monsCount >= 2)
+            isDoubleBattle = TRUE;
+[/color]
         for (i = 0; i < monsCount; i++)
         {
 
[color=red]-            if (gTrainers[trainerNum].doubleBattle == TRUE)[/color]
[color=seagreen]+            if (isDoubleBattle == TRUE)[/color]
                 personalityValue = 0x80;
             else if (gTrainers[trainerNum].encounterMusic_gender & F_TRAINER_FEMALE)
                 personalityValue = 0x78; // Use personality more likely to result in a female Pokémon
@@ -2067,7 +2071,7 @@ static u8 CreateNPCTrainerParty(struct Pokemon *party, u16 trainerNum, bool8 fir
             }
         }
 
[color=red]-        gBattleTypeFlags |= gTrainers[trainerNum].doubleBattle;[/color]
[color=seagreen]+        gBattleTypeFlags |= isDoubleBattle;[/color]
     }
 
     return gTrainers[trainerNum].partySize;
     

    dGxx

    • 124
    Posts
    8
    Years
    • Seen Apr 5, 2024
    Lunos said:
    No, there aren't any such specials.
    I don't think a special is what you'd want to use here anyway.
    If I were you, I'd just use a flag and make the relevant tweaks to CreateNPCTrainerParty, the function that fills gEnemyParty with a trainer's party data before a trainer battle starts.
    Ex:
    Code: 
    diff --git a/include/constants/flags.h b/include/constants/flags.h
index 8d98e3aa0..53d548930 100644
--- a/include/constants/flags.h
+++ b/include/constants/flags.h
@@ -42,7 +42,7 @@
 #define TEMP_FLAGS_END   FLAG_TEMP_1F
 #define NUM_TEMP_FLAGS   (TEMP_FLAGS_END - TEMP_FLAGS_START + 1)
 
[color=red]-#define FLAG_UNUSED_0x020    0x20 // Unused Flag[/color]
[color=seagreen]+#define FLAG_FORCE_DOUBLE_TRAINER_BATTLES    0x20 // Originally Unused Flag[/color]
 #define FLAG_UNUSED_0x021    0x21 // Unused Flag
 #define FLAG_UNUSED_0x022    0x22 // Unused Flag
 #define FLAG_UNUSED_0x023    0x23 // Unused Flag
diff --git a/src/battle_main.c b/src/battle_main.c
index c19089deb..5bc17dadf 100644
--- a/src/battle_main.c
+++ b/src/battle_main.c
@@ -1962,6 +1962,7 @@ static u8 CreateNPCTrainerParty(struct Pokemon *party, u16 trainerNum, bool8 fir
     u8 fixedIV;
     s32 i, j;
     u8 monsCount;
[color=seagreen]+    bool8 isDoubleBattle = gTrainers[trainerNum].doubleBattle;[/color]
 
     if (trainerNum == TRAINER_SECRET_BASE)
         return 0;
@@ -1985,10 +1986,13 @@ static u8 CreateNPCTrainerParty(struct Pokemon *party, u16 trainerNum, bool8 fir
             monsCount = gTrainers[trainerNum].partySize;
         }
 
[color=seagreen]+        if (FlagGet(FLAG_FORCE_DOUBLE_TRAINER_BATTLES) && monsCount >= 2)
+            isDoubleBattle = TRUE;
+[/color]
         for (i = 0; i < monsCount; i++)
         {
 
[color=red]-            if (gTrainers[trainerNum].doubleBattle == TRUE)[/color]
[color=seagreen]+            if (isDoubleBattle == TRUE)[/color]
                 personalityValue = 0x80;
             else if (gTrainers[trainerNum].encounterMusic_gender & F_TRAINER_FEMALE)
                 personalityValue = 0x78; // Use personality more likely to result in a female Pokémon
@@ -2067,7 +2071,7 @@ static u8 CreateNPCTrainerParty(struct Pokemon *party, u16 trainerNum, bool8 fir
             }
         }
 
[color=red]-        gBattleTypeFlags |= gTrainers[trainerNum].doubleBattle;[/color]
[color=seagreen]+        gBattleTypeFlags |= isDoubleBattle;[/color]
     }
 
     return gTrainers[trainerNum].partySize;
    Click to expand...

    hey lunos that actually made sense I was at that same function trying to edit it, just didnt know what to add to it.

    One question I do have is if I remove the line u mentioned:

    - gBattleTypeFlags |= gTrainers[trainerNum].doubleBattle;

    wouldnt this change how every battle this flag now needs instead of needing the ".doubleBattle = TRUE,"

    or it wouldnt change anything other than just also being able to use a flag to force a double battle even though the trainer attribute makes it a single?
     
    Lunos

    Lunos

    Random Uruguayan User
    • 3,116
    Posts
    15
    Years
    dGxx said:
    hey lunos that actually made sense I was at that same function trying to edit it, just didnt know what to add to it.

    One question I do have is if I remove the line u mentioned:

    - gBattleTypeFlags |= gTrainers[trainerNum].doubleBattle;

    wouldnt this change how every battle this flag now needs instead of needing the ".doubleBattle = TRUE,"

    or it wouldnt change anything other than just also being able to use a flag to force a double battle even though the trainer attribute makes it a single?
    Click to expand...

    It wouldn't change anything functionally speaking, because if you look at the top of the diff I posted, the local variable I introduced (isDoubleBattle) is set to gTrainers[trainerNum].doubleBattle by default.
    The doubleBattle field in a trainer's data is a boolean value that tells CreateNPCTrainerParty whether that trainer should be fought in a double battle or not.
    The line you brought up makes sure to set the BATTLE_TYPE_DOUBLE battle type flag based on the value of the doubleBattle field in the relevant trainer's data.
    What I did in the diff is to make CreateNPCTrainerParty handle the same functionality through a local variable instead, which I had to do because you can't manipulate the elements of an array directly. They can only be read. If the elements such as a trainer's doubleBattle present insi an array like gTrainers can't be edited directly, we have to delegate the work to a local variable that handles the default behavior plus whatever else we want.
     
    Last edited:

    dGxx

    • 124
    Posts
    8
    Years
    • Seen Apr 5, 2024
    Lunos said:
    It wouldn't change anything functionally speaking, because if you look at the top of the diff I posted, the local variable I introduced (isDoubleBattle) is set to gTrainers[trainerNum].doubleBattle by default.
    The doubleBattle field in a trainer's data is a boolean value that tells CreateNPCTrainerParty whether that trainer should be fought in a double battle or not.
    The line you brought up makes sure to set the BATTLE_TYPE_DOUBLE battle type flag based on the value of the doubleBattle field in the relevant trainer's data.
    What I did in the diff is to make CreateNPCTrainerParty handle the same functionality through a local variable instead, which I had to do because you can't manipulate the elements of an array directly. They can only be read. If the elements such as a trainer's doubleBattle present insi an array like gTrainers can't be edited directly, we have to delegate the work to a local variable that handles the default behavior plus whatever else we want.
    Click to expand...

    that's great, I will be implementing ur lines, thanks
     
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