Snowslide Slope Watt Trader Calculator.cs

void Main()
{
    // Initial state
    ulong s0 = 0x0123456789ABCDEF;
    ulong s1 = 0x0123456789ABCDEF;

    // Set this for how far you want to search.
    int maxAdvance = 200;

    Console.WriteLine("Adv | s0               | s1               | HL  | Reg");
    Console.WriteLine("----+------------------+------------------+-----+----");
    var rng = new Xoroshiro128Plus(s0, s1);
    for (int advances = 0; advances < maxAdvance; advances++)
    {
        GetStateWattTrader(advances, rng);
        rng.Next();
    }
}

// You can define other methods, fields, classes and namespaces here
private void GetStateWattTrader(int advance, Xoroshiro128Plus rng)
{
    var (s0, s1) = rng.GetState();
    var output = $"{advance:000} | {s0:x16} | {s1:x16} | ";

    var highlight = rng.NextInt(1000);
    var regular = rng.NextInt(9);
    output += $"{highlight, 3} | {regular}";

    // Add your filters here.
    //if (highlight != 827)
    //    return;

    Console.WriteLine(output);
}

Setup is:

1. Download/install LINQPad (latest version is fine).
2. Download dev build PKHeX from https://projectpokemon.org/home/files/file/2445-pkhex-development-build/
3. Press F4 in LINQPad and add PKHeX.Core.dll to first tab, and PKHeX.Core to second tab,
4. Change the language at the top to C# program, then copy/paste the script in verbatim.
5. Edit your params (distance to search, whether you want to see all advances).
6. Click run.

Recommended LINQPad settings so output is monospaced:

1. Edit > Preferences > Results
2. Click "Launch Editor" under Style Sheet for text (HTML) results.
3. Paste this snippet and "Apply Changes".

   body
   {
   	margin: 0.3em 0.3em 0.4em 0.4em;
   	font-family: Consolas;
   }
   

Use this sheet to figure out what you need to roll under Min/Max to get your desired item:
https://docs.google.com/spreadsheets/u/0/d/1pNYtCJKRh_efX9LvzjCiA-0n2lGSFnVmSWwmPzgSOMw/htmlview