diff --git a/graphics/backspriteflags.grit b/graphics/backspriteflags.grit
index 2cd0406..c04bc11 100644
--- a/graphics/backspriteflags.grit
+++ b/graphics/backspriteflags.grit
@@ -1 +1 @@
--gzl -gB4 -fts -pe64 -pzlz77 -gu8 -fh!
\ No newline at end of file
+-gzl -gB4 -fts -pe16 -pzlz77 -gu8 -fh!
diff --git a/graphics/backspr/gBackShinySprite385Castform.png b/graphics/castform/gBackShinySprite385Castform.png
similarity index 100%
rename from graphics/backspr/gBackShinySprite385Castform.png
rename to graphics/castform/gBackShinySprite385Castform.png
diff --git a/graphics/frontspr/gFrontSprite385Castform.png b/graphics/castform/gFrontSprite385Castform.png
similarity index 100%
rename from graphics/frontspr/gFrontSprite385Castform.png
rename to graphics/castform/gFrontSprite385Castform.png
diff --git a/graphics/castform/gritflags.txt b/graphics/castform/gritflags.txt
new file mode 100644
index 0000000..c0a572d
--- /dev/null
+++ b/graphics/castform/gritflags.txt
@@ -0,0 +1 @@
+-gzl -gB4 -fts -pe64 -pzlz77 -gu8 -fh!
diff --git a/graphics/frontspriteflags.grit b/graphics/frontspriteflags.grit
index 2cd0406..c04bc11 100644
--- a/graphics/frontspriteflags.grit
+++ b/graphics/frontspriteflags.grit
@@ -1 +1 @@
--gzl -gB4 -fts -pe64 -pzlz77 -gu8 -fh!
\ No newline at end of file
+-gzl -gB4 -fts -pe16 -pzlz77 -gu8 -fh!
diff --git a/scripts/build.py b/scripts/build.py
index be00d93..4347ba0 100644
--- a/scripts/build.py
+++ b/scripts/build.py
@@ -283,14 +283,17 @@ def ProcessSpriteGraphics():
     frontFlags = GetFlagsFromFlagFile(GRAPHICS + "/frontspriteflags.grit")
     backFlags = GetFlagsFromFlagFile(GRAPHICS + "/backspriteflags.grit")
     iconFlags = GetFlagsFromFlagFile(GRAPHICS + "/iconspriteflags.grit")
+    castformFlags = GetFlagsFromFlagFile(GRAPHICS + "/castform/gritflags.txt")
 
     backsprites = [file for file in glob(GRAPHICS + "/backspr" + "**/*.png", recursive=True)]
     frontsprites = [file for file in glob(GRAPHICS + "/frontspr" + "**/*.png", recursive=True)]
     iconsprites = [file for file in glob(GRAPHICS + "/pokeicon" + "**/*.png", recursive=True)]
+    castformsprites = [file for file in glob(GRAPHICS + "/castform" + "**/*.png", recursive=True)]
 
     ProcessSpriteSet(frontsprites, frontFlags, 'frontsprites.s', "Front Sprites")
     ProcessSpriteSet(backsprites, backFlags, 'backsprites.s', "Back Sprites")
     ProcessSpriteSet(iconsprites, iconFlags, 'iconsprites.s', "Icon Sprites")
+    ProcessSpriteSet(castformsprites, castformFlags, 'castformsprites.s', "Castform Sprites")
 
 
 def ProcessAudio(audioFile: str) -> str:
diff --git a/src/Base_Stats.c b/src/Base_Stats.c
index e361263..4169b7c 100644
--- a/src/Base_Stats.c
+++ b/src/Base_Stats.c
@@ -27133,7 +27133,7 @@ const struct BaseStats gBaseStats[] =
 		.ability1 = ABILITY_FLOWERVEIL,
 		.ability2 = ABILITY_NONE,
 		.safariZoneFleeRate = 0,
-		.hiddenAbility = ABILITY_NONE,
+		.hiddenAbility = ABILITY_SYMBIOSIS,
 		.noFlip = TRUE,
 	},