Add Past Stats to documentation

src/docs/pokemon.json

@@ -1207,6 +1207,14 @@
                             "of": "PokemonAbilityPast"
                         }
                     },
+                    {
+                        "name": "past_stats",
+                        "description": "A list of details showing stats this pokémon had in previous generations",
+                        "type": {
+                            "type": "list",
+                            "of": "PokemonStatPast"
+                        }
+                    },
                     {
                         "name": "sprites",
                         "description": "A set of sprites used to depict this Pokémon in the game. A visual representation of the various sprites can be found at <a href='https://github.com/PokeAPI/sprites#sprites'>PokeAPI/sprites</a>",
@@ -1344,6 +1352,27 @@
                     }
                 ]
             },
+            {
+                "name": "PokemonStatPast",
+                "fields": [
+                    {
+                        "name": "generation",
+                        "description": "The last generation in which the referenced pokémon had the listed stats.",
+                        "type": {
+                            "type": "NamedAPIResource",
+                            "of": "Generation"
+                        }
+                    },
+                    {
+                        "name": "stats",
+                        "description": "The stat the Pokémon had up to and including the listed generation.",
+                        "type": {
+                            "type": "list",
+                            "of": "PokemonStat"
+                        }
+                    }
+                ]
+            },
             {
                 "name": "PokemonHeldItem",
                 "fields": [