Buy a Roblox Gift Card and give the code to your friend
Ask your friend to redeem the gift card on Roblox
Buy Robux on your friend’s account if you have their permission and login access
Use a Roblox group payout if you own a group and your friend is in it
Sell a game pass or clothing item and have your friend buy it, then send them the proceeds through group funds
Use the Roblox Marketplace to transfer value indirectly through items
Avoid any third-party “Robux generator” or “free Robux” service