I was wondering how I could play a game I've made on a console (PS3). I don't want to sell it or anything I just want to test it for now, also do I still have to do that whole registration thing to do this? Oh, I'm also using Unreal Engine 4 for this.
Unreal Engine 4 doesn't support the PlayStation 3, but it does support the PlayStation 4. It and the Xbox One both use processors built around the AMD Jaguar core, which are comparable to AMD's Kabini processor. This suggests testing your game on a PC with an Athlon 5150 processor as a proxy for performance on a PS4.
Another proxy for PS4 performance is the Xbox One. Since sometime in 2016, anybody with an unbanned Xbox One console, a legit copy of Windows 10, and a Developer Center account ($19 one-time for individuals) can activate developer mode.
Once your game is feature-complete and playable with a controller, then you can form a small company (such as LLC or S corporation), register a domain, finish this or another PC game, get a static IP for your office, and join Sony's developer program.