feature: implement basic model

app/models/pokemon.rb

@@ -0,0 +1,4 @@
+class Pokemon < ApplicationRecord
+  has_many :pokemon_types
+  has_many :types, through: :pokemon_types
+end

app/models/pokemon_type.rb

@@ -0,0 +1,4 @@
+class PokemonType < ApplicationRecord
+  belongs_to :pokemon
+  belongs_to :type
+end

app/models/type.rb

@@ -0,0 +1,4 @@
+class Type < ApplicationRecord
+  has_many :pokemon_types
+  has_many :pokemons, through: :pokemon_types
+end

db/migrate/20211012155732_create_pokemons.rb

@@ -0,0 +1,14 @@
+class CreatePokemons < ActiveRecord::Migration[6.1]
+  def change
+    create_table :pokemons do |t|
+      t.string :name
+      t.integer :base_experience
+      t.integer :height
+      t.boolean :is_default
+      t.integer :order
+      t.integer :weight
+
+      t.timestamps
+    end
+  end
+end

db/migrate/20211012160110_create_types.rb

@@ -0,0 +1,9 @@
+class CreateTypes < ActiveRecord::Migration[6.1]
+  def change
+    create_table :types do |t|
+      t.string :name
+
+      t.timestamps
+    end
+  end
+end

db/migrate/20211012160339_create_pokemon_types.rb

@@ -0,0 +1,11 @@
+class CreatePokemonTypes < ActiveRecord::Migration[6.1]
+  def change
+    create_table :pokemon_types do |t|
+      t.belongs_to :pokemon
+      t.belongs_to :type
+      t.integer :slot
+
+      t.timestamps
+    end
+  end
+end