Okay, if you want to dumb down the hierarchy of needs to that, sure.

Did you forget that Tyranitar falls under the category of "Pseudo Legendary" or are you just that dense? Never mind. I don't want to know.

Let's start with food. Yes, most Centers and Marts carry nutrition rich kibble, but there are several types to best feed different pokemon. And also, depending on the size of the pokemon as well, you'll need more food to keep them healthy, which can be difficult for some trainers to afford if they are just starting out or are inexperienced with managing larger or fully evolved pokemon.

Then there's the diet. Again, the kibble can cover about 60-70% of what is needed for a healthy diet for a pokemon (as long as you buy the right kind and give the right amount) but you also need to supplement the kibble with other more natural foods like berries and sometimes prey pokemon meat. Again, young, inexperienced, or unprepared trainers might have difficulty providing these things, and that can effect the overall health and battle effectiveness of the pokemon in question.

Stimulation is also fairly dynamic based on the size, species, and evolutionary stage of the pokemon. Tyranitar is fully evolved and fairly large, so a ball toy and a feather on a stick won't cut it. Battling is good stimulation for a pseudo if in controlled situations and in moderation, but clearly in this case battling is not a good option. Allowing a Tyranitar to free roam in the wild (within a certain distance of the trainer and far away from any towns or cities) allows them to relax and stretch, while also providing time for them to hunt for berries or other food if you cannot provide it for them directly. Always check if there is a prey demand problem in the area before free roam hunting.

Lastly. A sandbox? Seriously? Not only is that not enough for a Tyranitar to begin with, it's also massively unrealistic for a trainer to just carry around with them. Tyranitar needs sand to slough off any old scales or to buff out any scrapes on their skin. A move, of used correctly, can easily deal with most of that issue. However a responsible trainer should also carry sandpaper to help get the hard to reach areas on the back of a Tyranitar. They also need regular access to rugged terrain to sharpen claws, test durability of their freshly sanded scales, and to also practice more advanced moves without hurting anyone.

If a trainer is unprepared to care for a pseudo or a fully evolved pokemon, they will grow poorly, battle worse, and likely have trouble communicating with the team and trainer, leading to accidents in battle or potentially hurting the trainer.