Using any of the best Android phones available on the market today will more or less be good enough. Thermal throttling is when your phone decreases the amount of work it completes in order to cool down, which can have a detrimental effect on performance as your phone heats up. Games that don't require as much processing power will still work fine on a Snapdragon 845, but you should also be mindful of thermal throttling. Any newer chips than that will progressively get better performance, but I would personally class the Snapdragon 845 as the bare minimum for playing most big titles.
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For now, anything that's a Qualcomm Snapdragon 845 or newer should do the job for basic emulation.