First of, I would say no!
I have pygmy cories, and I have to say I'm taking bad care of them right now, simply due to the fact that I only have two right now and I prefer to be in a minimum shoal of six recommended ten and above. I'm a bad fish daddy I know. D:
They're fast swimmers, faster than any fish I've owned before they dart around like little monkeys to be honest, they're cute fish. I wouldn't trust Wikipedia since, well it's Wikipedia! Now seriouslyfish recommends a minimum of 42.5 litres which is roughly around 11 gallons.
So once again, no I would not recommend pygmy cories in such a small tank, 10 gallons is the minimum for them. :D