func main() {
    //..http request

    //..parse using html.parse().

    // Define a function to iterate through the HTML document
    var processAllPokemon func(*html.Node)
    processAllPokemon = func(n *html.Node) {
        // Check for all <li> elements
        if n.Type == html.ElementNode && n.Data == "li" {
                    // Process the details of the Pokémon within this <li> element
                    processPokemonDetails(n)
        }

    //.. rest of the code remains the same