The 31/X/31/31/31/31 Timid Latias with the OT Rells would be awesome. The best Pokemon I have(I think) for trading is a 31/x/31/x/31/31 Shiny Speed Boost Scolipede(no egg moves), which I got extremely lucky and hatched(my first few years playing Pokemon I saw one shiny, and in my time playing sixth gen I've gotten more than 10. Go figure.) It has EVs, not sure what, though(some split between HP, Def, and Spe that was at one time or another, I think, suggested on Smogon-probably for OU.)
The only other thing you might be interested in, considering you're already drowning in Suicunes, is a 30/31/31/31/30/31 Bold Cresselia I SRed for. The IVs are annoying, I've never gotten such good IVs on a legendary before, but the two thirties are in stats that really should be perfect, meanwhile Cresselia has no qualms about a slightly imperfect SpA or Speed stat, and actually likes low attack, bot ofc I got a 31 in those stats.