pokemon.trade/app/javascript/packs/frontend/components/pages/pokemon.jsx

import React from 'react';
import {Route, Switch} from 'react-router-dom';

import ShowPokemon from './pokemon/show';

function Pokemon() {
  return (
    <>
      <Switch>
        <Route path="/pokemon" component={ShowPokemon} />
      </Switch>
    </>
  );
}

export default Pokemon;