Not showing dex entries until getting the Pokédex

Credit to Jaizu

In Generation 3, you normally can't catch Pokémon without getting the Pokédex first. Because of this, it assumes that if you catch a Pokémon, you must have the Pokédex, so it shows the entry.

With this change, if you catch a Pokémon without having the Pokédex, it won't show their entry. It will still register them, for when you do get the Dex.

Open src/battle_script_commands.c. Find Cmd_trysetcaughtmondexflags and add the following else if in between the existing if and else:

static void Cmd_trysetcaughtmondexflags(void)
{
    u16 species = GetMonData(&gEnemyParty[gBattlerPartyIndexes[GetCatchingBattler()]], MON_DATA_SPECIES, NULL);
    u32 personality = GetMonData(&gEnemyParty[gBattlerPartyIndexes[GetCatchingBattler()]], MON_DATA_PERSONALITY, NULL);

    if (GetSetPokedexFlag(SpeciesToNationalPokedexNum(species), FLAG_GET_CAUGHT))
    {
        gBattlescriptCurrInstr = T1_READ_PTR(gBattlescriptCurrInstr + 1);
    }
+   else if (!FlagGet(FLAG_SYS_POKEDEX_GET))
+   {
+       HandleSetPokedexFlag(SpeciesToNationalPokedexNum(species), FLAG_SET_CAUGHT, personality);  
+       gBattlescriptCurrInstr = T1_READ_PTR(gBattlescriptCurrInstr + 1);
+   }
    else
    {
        HandleSetPokedexFlag(SpeciesToNationalPokedexNum(species), FLAG_SET_CAUGHT, personality);
        gBattlescriptCurrInstr += 5;
    }
}