Namely, the Bag, Trainer ID, Save, and Options items are visible at the bottom of the device's screen. Since you do not yet have Pokémon, and no one has given you a Pokédex, it makes sense that the player character would not have those apps installed. But this brings up even more questions about how the PokéNav Plus functions, as well as how Bags function.
Three of the options here make a lot of sense. The ability of the PokéNav to examine the status of your Pokémon was explicit even in RSE, where you could check your Pokémon's Conditions (i.e. Contest stats) from the PokéNav option in the pause menu. So the PokéNav Plus's apparent ability to check your Pokémon's status is consistent with this fact. I don't think RSE drew as clear a connection between your party screen (the one accessed from the Pokémon option in the pause menu) and the PokéNav, but this seems to suggest that, at least in ΩRαS, the party screen is not just an abstraction for the player, but something that the player character is directly using in-universe. Likewise, the saving feature is shown in-game as the player character writing down what happened to them in a journal, so the save feature being some kind of journaling app makes sense. And the Options menu is obviously a settings menu for the device. But the other three "apps" have some complications.
Firstly, the Pokédex. This seems to suggest that the Pokédex in ΩRαS is a PokéNav app, rather than its own device. While SwSh and SV similarly have their Pokédexes as a phone app, almost every other instance of the Pokédex is at least implied to be a self-contained device. This is interesting in and of itself, but when Professor Birch gives you the Pokédex, he says that he "ordered" it, implying that the Pokédex is a physical object that needed to be ordered and delivered rather than a piece of software to be downloaded and installed. This seems to conflict with the implications of this screenshot. There are a couple of explanations that could be offered to reconcile this conflict; perhaps the Pokédex here is a hardware add-on to the PokéNav, or perhaps the PokéNav can interface wirelessly with the Pokédex. Or, if the Pokédex is still just an app, maybe whoever made the Pokédex in this timeline charges users an installation fee, similar to how Microsoft charges for their Office suite or Adobe for their programs; people do sometimes use "ordered" in the context of software when they are buying it rather than just downloading it for free.
Secondly, what I would consider to be the Gigantamax Copperajah in the room, the Bag. You can access your Bag menu through the PokéNav. Does this mean that your bag interfaces with the PokéNav? That it's essentially a personal PC system you can store items in? Being able to store items in a computer has been around ever since Red and Blue, where you had limited bag space and the PC was a way to store items you weren't using so they didn't clog your bag. And storing items has always been done through the player character's PC, not through Bill's PC or Lanette's PC or whoever else's PC. And ever since Diamond and Pearl, bag space has been infinite, and the ability to store items in stationary PC devices rendered obsolete and thus removed. Is this the Watsonian reason for this? That a portable means of accessing people's Item Storage System was found? So your bag is basically a hard drive where your items are digitally stored until they are called upon? (As a side note, this also potentially means that item duplication glitches exist in universe.) I realize this may be old news at this point, but I find the connection between the bottomless Bag and the Item Storage System fascinating. And it seems that in ΩRαS, the PokéNav Plus is the means by which you access your personal item storage.
This doesn't necessarily explain the Trainer Card, though. The Trainer Card seems to be shown as a physical object that is inlaid into a physical badge case. Perhaps it's a similar story to the Bag items.
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