its not the worst for botw or totk, I was getting stable 30fps in totk back around a month after release. Violet tho, it was pretty unoptimized last time I tried. I will say tho emulating pokemon games get kinda boring as you lose out on all the “multiplayer” aspects of it.

The Usb-C cable has to be a usb-c VIDEO cable. Not just any usb-c Cable

Correct Cable

https://www.amazon.com/Thunderbolt-Compatible-Tablets-Samsung-More-6-6ft/dp/B087QFRYVZ/

Something like this. Keep in mind, that you cannot use certain thunderbolt 3 cable as the steam deck does not support it.

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This is the WRONG cable and can do charge and data but not video

https://www.amazon.com/Anker-Charging-MacBook-Galaxy-Charger/dp/B088NRLMPV

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Usb-C video capable cables are I would say almost double thickness compared to regular usb-c cables.