diff --git a/pokemon.schema.json b/pokemon.schema.json
index fc22fbb..ee3c44f 100644
--- a/pokemon.schema.json
+++ b/pokemon.schema.json
@@ -256,17 +256,87 @@
           "type": "array",
           "items": {
             "type": "object",
+            "required": ["species", "method", "data"],
             "properties": {
               "species": {
                 "type": "string"
               },
               "method": {
-                "type": "string"
-              },
-              "data": {
-                "type": "string"
+                "type": "string",
+                "enum": [
+                  "level",
+                  "item",
+                  "itemmale",
+                  "itemfemale",
+                  "holditem",
+                  "dayholditem",
+                  "nightholditem",
+                  "hasmove",
+                  "happiness",
+                  "happinessday",
+                  "happinessnight",
+                  "levelfemale",
+                  "levelmale",
+                  "trade",
+                  "tradespecies",
+                  "tradeitem",
+                  "location",
+                  "custom"
+                ]
               }
-            }
+            },
+            "anyOf": [
+              {
+                "properties": {
+                  "method": {
+                    "enum": [
+                      "level",
+                      "levelfemale",
+                      "levelmale",
+                      "happiness",
+                      "happinessday",
+                      "happinessnight"
+                    ]
+                  },
+                  "data": {
+                    "type": "integer"
+                  }
+                }
+              },
+              {
+                "properties": {
+                  "method": {
+                    "enum": [
+                      "item",
+                      "itemmale",
+                      "itemfemale",
+                      "holditem",
+                      "dayholditem",
+                      "nightholditem",
+                      "hasmove",
+                      "trade",
+                      "tradespecies",
+                      "tradeitem",
+                      "location"
+                    ]
+                  },
+                  "data": {
+                    "type": "string"
+                  }
+                }
+              },
+              {
+                "properties": {
+                  "method": { "enum": ["custom"] },
+                  "data": {
+                    "type": "array",
+                    "items": [
+                      {"type": "string", "description": "Method identifier"}
+                    ]
+                  }
+                }
+              }
+            ]
           }
         }
       }