how will you get the cupcake launcher in rivals

The Cupcake Launcher in Roblox Rivals appears to be tied to the Roblox gear/catalog item rather than a special in-game unlock, so the straightforward way to get it is to obtain the Cupcake Launcher gear itself from Roblox and then use it in-supported contexts. The item is listed as a Roblox catalog gear and can be purchased for 300 Robux.

What to do

• Buy the Cupcake Launcher from the Roblox catalog for 300 Robux.

• After you own it, check whether Rivals currently allows that gear in the mode or event you’re playing, since game-specific availability can change.
• If you were asking about a Rivals update reward instead, recent Rivals birthday-update videos were about other items like a charm, not the Cupcake Launcher itself.

Why this is likely the answer

The search results point to the Cupcake Launcher as a general Roblox gear item, while Rivals-related results mostly reference other weapons and birthday-update rewards, not a dedicated Cupcake Launcher unlock path. So the most reliable method is owning the catalog item rather than hunting for a hidden Rivals quest.

Quick note

If you mean a different “cupcake launcher” inside a specific Rivals event, the exact unlock method may be event-limited, but the public information I found does not show a special Rivals-only quest for it.