I believe Brazil has strongest beach volley duo male, also strong female duo, great Judo, very strong regular volleyball both male and female. Good but not great basketball, still worthy of attention. They also have great athletes on both swimming and open running marathons. They also have dominated MMA for a very long time, probably longest in history so far, if you consider this a sport, I do not like it personally.
Well, they can't compete in Winter Sports, not because they are shit, but because the country won't invest in sending athletes to other countries to practice for those. Even the most popular sports are hardly a priority that the country consistently invest on.