This Seeking Tech guide will explain how you can download the PS5 exclusive Scarlet Spider Costume for free in Marvel Rivals.
For the first step, navigate over to the Marvel Rivals icon on the home screen.
Next, scroll downwards until you see the Add-Ons section.
You should then be able to select Scarlet Spider.
Afterwards, select the Free option.
You should now be able to use the skin in Marvel Rivals.