JAVA Converting arrays into die and using random module

I'm new with both random and arrays and I'm trying to get them to work together.

I'm trying to write a program that can take lists of arrays, turn those arrays into die and 'roll' them, and then convert them back to arrays so I can edit the lists. I'm pretty sure the best approach to do this will be through arrays, as I will be editing the dice pools throughout the program. To make editing these dicepools easier, I have them stored in a separate file so I can track the changes and my internal code isn't constantly changing.

 System.out.print("Welcome to the world of Pokemon, Trainer! "
                 + " What is your name? ");
//Intro. Save playerName variable and create a doc for player's Pkmn
PlayerName = keyboard.nextLine();
System.out.println("Here's your first Pokemon. It's a little weak"
                   + " but you'll just have to catch stronger ones."
                   + " GO CATCH 'EM ALL!");

        try (PrintWriter writer = new PrintWriter("MyPkmn.txt")) {
            writer.println("int[][] MyPkmn =");
            writer.println("{1, 1, 2, 2, 2, 3}");
            writer.println("};");

The separate files that I will be editing so far look like this: MyPkmn: (generated from code above)

   int[][] MyPkmn ={1, 1, 2, 2, 2, 3}};

And the array that I'm really struggling with, WildPkmn: (will be pre-existing)

   int[][] WeakPkmn = {
    {0, 0, 1, 1, 2, 2},
    {0, 0, 1, 1, 2, 2},
    {0, 0, 1, 1, 2, 2},
    {0, 0, 1, 1, 2, 2},
    {0, 0, 1, 1, 2, 2},
    {0, 0, 1, 1, 2, 2},
    {0, 0, 1, 1, 2, 2} 
    };

    int[][] StrgPkmn = {
    {0, 2, 2, 3, 3, 4},
    {0, 2, 2, 4, 3, 4},
    {0, 2, 2, 4, 3, 4},
    {0, 2, 2, 4, 3, 4} 
    };

    int[][] UltmPkmn =  {
    {0, 18, 16, 12, 10, 8},
    {0, 18, 16, 12, 10, 8} 
    };

I'm not sure if I should be using three 2x2 arrays or a 3x3 array.

I want use random to pull a single die out of the list of WildPkmn array; (if I use a 3x3x(3), that is how I can have the code identify what kind and tell the player the 'type' of Pokemon they have encountered),then convert that array into a die and roll it.

Also I will roll each of the die from MyPkmn arrays and I will compare totals.

Depending on a win or loss, I want to be able to take the WildPkmn die, delete that specific row from the WildPkmn file, and add that row to the MyPkmn file.

I can attach my pseudocode if I'm still confusing.