Can I set alerts for just one rival?

Yes. Custom alerts for a single rival come with Studio.

1. Open Alerts.
2. Under Add an alert, pick what you want to hear about.
3. In For, choose Only one rival and pick the game.
4. Choose when and where it should reach you, then click Add alert.

This is handy for the one rival launching right next to you: hear about its every move right away, while the rest wait for your briefing.

On Free and Indie, alerts cover all rivals of a game, or all your games at once.

Tip: pair a single-rival alert for release date changes with Discord, so your whole team sees the moment your closest rival moves its date.