diff --git a/pokemonred_puffer/environment.py b/pokemonred_puffer/environment.py
index 1e6db18..20617e7 100644
--- a/pokemonred_puffer/environment.py
+++ b/pokemonred_puffer/environment.py
@@ -343,7 +343,7 @@
     SPECIES_IDS["SLOWBRO"],
     SPECIES_IDS["SEEL"],
     SPECIES_IDS["DEWGONG"],
-    SPECIES_IDS["SHELDER"],
+    SPECIES_IDS["SHELLDER"],
     SPECIES_IDS["CLOYSTER"],
     SPECIES_IDS["KRABBY"],
     SPECIES_IDS["KINGLER"],