RNG in DWC is both very complicated and not. From my research into how this game ticks, there are 2 different seeds that influence your "luck" in the game.

1. Game Seed
2. Cage Seed

First thing to understand about both seeds is that they are in a range between 1-103 and are picked when you boot up the game. This means that there is really only 103 outcomes to every scenario. As well as these seeds are not static and change depending on your choices.

The Game Seed is influenced by and controls the game state. The Game Seed controls battle outcomes, what Digimon show up when you hunt and their stats and natures, and what arena gets chosen (This one is important). It gets influenced by:

• Booting up the game (Randomized based on the second on the clock so can only be around 60 different seeds)
• Continuing a Game (Adds an unknown amount to the seed)
• Setting your name at the start of the game (Adds +34 to the seed)
• Tapping on a battle without entering (+1 to the seed)
• Confirming a battle after tapping (+1 to the seed)
• Ending the Day (Adds an at the moment unknown amount to the seed)
• Hunts (Randomizes the seed every frame)

The Cage Seed is influenced by and controls the cage part of the game. The Cage Seed controls training luck, Digimon stats, APs and nature when they hatch, controls what mail you get and can influence how your Digimon act. Here is what influences this seed:

• Booting up the game (Randomized based on the second on the clock so can only be around 60 different seeds)
• Entering your Cage screen (Adds to the seed based on how many Digimon you own)

Now that we know what each seed does, how do we influence these seeds? Well for the Cage Seed I am still at a loss since it is almost impossible to know your seed to even influence it, but for the Game Seed there is something you can check to get granular control.

And that is the Battle Menu, which adds 1 to the seed when you tap a battle and adds another when you tap yes to enter the battle. From this I have made a lookup table where you can look at which random arena you get in a battle and then look at it again by exiting and entering again or by battling and winning then going back for more. Here is the step by step process:

• Step 1: Go into the battle menu and find a free battle, doesn't matter which one.
• Step 2: Click on the free battle (This adds +1 to the game seed) and click accept (This adds another +1 to the seed).
• Step 3: Note down which arena you got.
• Step 4: Either do the battle and the go back into the battle menu, or exit the free battle menu and do Step 2 again.
• Step 5: Note down what the second arena was and consult the chart. (It will be 2 numbers up from your last arena)
• Step 6: Do this for as many times as it takes to find your seed and now you know your game seed for that day!

This can probably be done while you are losing battles to get the digimon's evolutions up. This also isn't a complete solution as when you end day it seems to add an unknown number as it's not a consistent amount. And when you hunt the Game Seed goes for vacation and you'll have to find it again.

I will update this as soon as I find solutions for the Game Seed.