What’s the best way to emulate this game? What emulator should I use? Where’s the best place to get said emulator? And what should I run it on?

I don’t really have access to a very accurate timer for milliseconds on my phone, so I was wondering: do the mods retime submitted runs? Or do they just verify it as the time you estimate it at? I ask because only one of my runs has been verified so far and it was verified as what I submitted it as. While it may have been retimed, I don’t know if it was.