Pi 5: dolphin/other GC emulator on raspbian?

If I really need to make it a standalone thing that runs directly off of the SD card to be able to play GameCube games I guess I can do that but I did already buy a mouse and keyboard specifically for it and I would hate to not make use of it. I would also prefer if I didn't have to swap the SD card every time I want to use raspbian

Also bonus question: do I have to buy a Raspberry Pi 5 power supply cord or can I just get like a USB to USBC cable that has the same output?

I want to have a portable battery without having to buy some expensive overcomplicated one made specifically for a pi 5

And before anyone says anything, yes I know, most raspberry pis are going to be complicated. But if I can make it easier on myself I will

(if anyone's curious, the project I'm doing is basically turning a SpongeBob laptop learning toy into an actual laptop. One of my goals is to be able to run Battle for Bikini Bottom)

You need to have a Power supply that has PD 5v/5A support.

What does the PD mean?

PD = Power Delivery

And PD is the way that the power supply tells Raspberry Pi what power it can deliver.