pokemon.trade/config/routes.rb

Rails.application.routes.draw do
  # For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html

  root to: "welcome#root"

  namespace :api, defaults: { formats: :json } do
    namespace :v1 do
      resources :pokemon do
        collection do
          post :upload
        end
      end
    end
  end
end