Program.cs

using System;
using System.Drawing;
using System.Net;
using System.Text.Json.Nodes;

namespace ImagesInConsole
{
    internal class Program
    {
        public static string url = "https://pokeapi.co/api/v2/pokemon/";
        static void Main(string[] args)
        {
            while(true) 
            {
                Console.SetWindowSize(Console.LargestWindowWidth, Console.LargestWindowHeight);
                Console.SetBufferSize(Console.WindowWidth, Console.WindowHeight);
                Console.SetCursorPosition(0, 0);    
                Console.Clear();
                Console.ForegroundColor = ConsoleColor.White;   
                string pokemonName = AskForAPokemon();
                int accuracy = AskForAccuracy();
                string url = GetPokemonImage(pokemonName);
                Bitmap image = DownloadImageFromUrl(url, pokemonName);
                //Bitmap picture = new Bitmap("C:\\Users\\krust\\OneDrive\\Bureau\\C#\\ImagesInConsole\\vert.jpg");
                PixelWriter pw = new PixelWriter(image, accuracy);
                pw.PictureAnalyzer();
                Console.ReadLine();
            }
            
        }

        static string AskForAPokemon()
        {
            Console.WriteLine("Veuillez entrer le nom d'un pokemon : ");
            string? pokemonName = Console.ReadLine();
            return pokemonName;
        }

        static int AskForAccuracy()
        {
            Console.WriteLine("Entrez une résolution (40 basse résolution, 200 très haute résolution) : ");
            int accuracy = Convert.ToInt32(Console.ReadLine());
            return accuracy;
        }

        static string GetPokemonImage(string pokemonName)
        {
            string fullUrl = url + pokemonName;
            string json = new WebClient().DownloadString(fullUrl);
            JsonObject root = JsonNode.Parse(json).AsObject();
            return (string)root["sprites"]["other"]["official-artwork"]["front_default"];
        }

        static Bitmap DownloadImageFromUrl(string urlToDownload, string pokemonName)
        {
            string url = urlToDownload;

            WebClient client = new WebClient();
            byte[] imageData = client.DownloadData(url);

            using (System.IO.MemoryStream ms = new System.IO.MemoryStream(imageData))
            {
                Bitmap bitmap = new Bitmap(ms);

                //bitmap.Save(pokemonName + ".png");
                //bitmap.Save("C:\\Users\\krust\\OneDrive\\Bureau\\C#\\PokeApiJsonConsole\\" + pokemonName + ".png");

                return bitmap;
            }
        }
    }
}