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If a competitor were to do this, how could I prove that this was happening? Would I have to check the google cache of each listing? What if they don't have a cache?
check his real html content with this tool:
Assuming he has prevented the Google cache, the easiest way is to
search for a peculiar phrase that is included in your site but nowhere else.
If he appears in the SERPs, that phrase is present in the content spidered.
I don't have the Google translators in my list of Google spider IPs.
I read on another forum of a black hat that showed he could steal the position of a competitor by triggering the dup filter and using cloaking to hide it.
I don't think it works that way. If Google has a site indexed, and then a second site comes up with dup content, it leaves out the second site. It doesn't replace the first site with the second. Cloaking is irrelevent here.