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+## Chain Fishing
+
+This adds the chain fishing feature to emerald, where reeling in consecutive pokemon species increases the number of chances of it being shiny by up to 41 total times `(1 + 2 * streak)`
+
+### Open [src/wild_encounter.c](../blob/master/src/wild_encounter.c)
+**1.** We need 3 new EWRAM_DATA variables:
+```diff
++ EWRAM_DATA u8 gChainFishingStreak = 0;
++ EWRAM_DATA static u16 sLastFishingSpecies = 0;
++ EWRAM_DATA bool8 gIsFishingEncounter = FALSE;   //same as in dizzyegg's item expansion repo
+```
+**2.** Add the non-static EWRAM_DATA variables to [include/wild_encounter.h](../blob/master/include/wild_encounter.h):
+```diff
++ extern u8 gChainFishingStreak;
++ extern bool8 gIsFishingEncounter;
+```
+
+**3.** Find the function `FishingWildEncounter` and make the following edits
+```diff
+void FishingWildEncounter(u8 rod)
+{
+    u16 species;
+
++   gIsFishingEncounter = TRUE; //must be set before mon is created
+    if (CheckFeebas() == TRUE)
+    {
+        u8 level = ChooseWildMonLevel(&gWildFeebasRoute119Data);
+        species = gWildFeebasRoute119Data.species;
+        CreateWildMon(species, level);
+    }
+    else
+    {
+        species = GenerateFishingWildMon(gWildMonHeaders[GetCurrentMapWildMonHeaderId()].fishingMonsInfo, rod);
+    }
+
++    if (species == sLastFishingSpecies && gChainFishingStreak < MAX_CHAIN_FISHING_STREAK)
++        gChainFishingStreak++;
++    else
++        gChainFishingStreak = 0;    //reeling in different species resets chain fish counter
++
++    sLastFishingSpecies = species;
+    IncrementGameStat(GAME_STAT_FISHING_CAPTURES);
+    SetPokemonAnglerSpecies(species);
+    BattleSetup_StartWildBattle();
+```
+**4.** Reset the chain counter
+- Open [src/battle_main.c](../blob/master/src/battle_main.c)
+- - add `#include "wild_encounter.h"` to the top
+- - find the function, `FreeResetData_ReturnToOvOrDoEvolutions` and change to the following:
+```diff
+    if (!gPaletteFade.active)
+    {
++        gIsFishingEncounter = FALSE;
+        ResetSpriteData();
+        //etc
+```
+- Open [src/field_player_avatar.c](../blob/master/src/field_player_avatar.c)
+- - At the top of the functions `Fishing_NotEvenNibble` and `Fishing_GotAway`, add the following:
+```c
+gChainFishingStreak = 0;
+```
+- Open [src/fieldmap.c](../blob/master/src/fieldmap.c)
+- - add `#include "wild_encounter.h"` to the top
+- - find the function `InitMap` and add the following to the top to reset when the player changes maps
+```c
+gChainFishingStreak = 0;
+```
+**5.** Increase the shiny rate
+- Open [src/pokemon.c](../blob/master/src/pokemon.c)
+- add `#include "wild_encounter.h"` to the top
+- Find the function `CreateBoxMon`
+- define `u32 shinyValue;` at the top
+- remove Line 2207, `SetBoxMonData(boxMon, MON_DATA_PERSONALITY, &personality);`
+- edit the personality generation section underneath `else //Player is the OT` to:
+```diff
+    else //Player is the OT
+    {
++        u32 rolls = 0;
++        u32 shinyRolls = 0;
+
+        value = gSaveBlock2Ptr->playerTrainerId[0]
+              | (gSaveBlock2Ptr->playerTrainerId[1] << 8)
+              | (gSaveBlock2Ptr->playerTrainerId[2] << 16)
+              | (gSaveBlock2Ptr->playerTrainerId[3] << 24);
+
++        #ifdef ITEM_SHINY_CHARM
++        if (CheckBagHasItem(ITEM_SHINY_CHARM, 1))
++            shinyRolls += 3;  //if you have the shiny charm, add 3 more rolls
++        #endif
++
++        if (gIsFishingEncounter)
++            shinyRolls += 1 + 2 * gChainFishingStreak; //1 + 2 rolls per streak count. max 41
++
++        if (shinyRolls)
++        {
++            do {
++                personality = Random32();
++                shinyValue = HIHALF(value) ^ LOHALF(value) ^ HIHALF(personality) ^ LOHALF(personality);
++                rolls++;
++            } while (shinyValue >= SHINY_ODDS && rolls < shinyRolls);
+        }
+    }
+
++    SetBoxMonData(boxMon, MON_DATA_PERSONALITY, &personality);
+   SetBoxMonData(boxMon, MON_DATA_OT_ID, &value);
+   //etc...
+```