I agree this would be great, Some other things that could be added:
- Unlimited Raw Materials (I can't really make an actual script or anything but I managed to change this value myself to over 2,000)
- Unlimited Pikmin Count (All the different colors so you don't need to farm pellets or caves for wild pikmin to up your pikmin count, I'm sure this is possible because in the Piklopedia once you have access to it you can call out pikmin and the menu shows 9999999)
- Unlimited Items (Ice Blast, Mines, Ultra-Spicy Spray, etc... I was able to change these on my own to 99 but wish it was unlimited)
- Unlimited pup drive points
A trainer for Pikmin 4 would indeed be great, especially for blocking time.
Edit:
For those interested, I've just found this trainer, to be placed in the mods slot. [Link]
Have a good game
I saw this as well and I would say make sure to backup your save since it seems like this method can introduce issues that can mess up the save file based on reading some of the comments...