There are lots of schools in the US with decent grad programs that don't even require submission of a PGRE score. Even still, 25th percentile will get you into more than a handful of schools that do require it -- however, being international might put you at a disadvantage. The low PGRE scores I've seen get into programs are usually domestic, though I wouldn't say this is a hard rule, just an observation.
A few schools off the top of my head are Brown, Tufts, U Alabama, and Georgia Tech. I have more on my list, as I also did poorly on the PGRE, but most of mine are Astro and I'm not sure what your research interests are.
A helpful website is gradschoolshopper. Here is a link to their list, sorted by PGRE requirement. It will say yes - required, yes - recommended, or no. The "recommended" ones are typically schools where a strong PGRE will help a lot, but no PGRE won't "hurt" your application if you can prove yourself with your other credentials. You can also use the top bar to sort by "accepted" PGRE score, but I'd also take that information with a grain of salt. Hope this helps.http://www.gradschoolshopper.com/gradsc ... ?q=3&cid=7