>>54746104There’s lots of reasons to use it, particularly in doubles. Think about it - your opponent wants to kill one of your mons because it’s a threat to them - so they use both of their mons to attack it. If you read the situation correctly, you protect with the mon they’re targeting - negating their whole turn - and then you’re free to do whatever you want with your other mon. Whether that’s setting up a hazard/screen/tailwind, hitting Dragon Dance, healing, or even more simply throwing out a strong attack - potentially killing an opponent’s mon or at least putting them in range of now being one-shot.
And depending on the move being protected, a lot more could happen. Maybe you stopped a rapid spin from happening, or a volt-switch, or even something like a will-o-wisp, that could have crippled your mon’s usefulness for the rest of the game.
Stall exists (and leftover healing is a thing you also didn’t mention), but it isn’t really the main thing Protect is giving you. Denial is really powerful.