Just list one product variation I'm developing a videogame store with Commerce (I'm n00b in Drupal), so for example I'm adding a new game "GTA V", GTA has versions to XBOX360 and PS3, so I'm trying to create the product and add two variations for PS and XBOX with different prices and some stuff, but I don't need a product page where the user selects PS or XBOX version, because I'm splitting my site by consoles, so if the user is in XBOX section, I need to list only the XBOX variation and not the PS variation.

I'm trying to achieve this because I don't wanna repeat myself with description, videos, etc of video games, so in the "GTA V" example I will write just one description and not two (for PS and XBOX) that will be the same.
You can just use views to filter on the catalog pages for product variations if they are set. You should take a look at http://www.drupalcommerce.org/user-guide/products the guide will help you create product variations, you can then create a view for the catalog, you can then create a exposed filter (lets the users change the filter value) for product variation so they user can select PS3 or XBOX and get only those products on the filter. But if you went to that page, you would still need to select "PS3" or "XBOX" to place a order.