I used to watch Pokemon when it first started in the late 1990s - early 2000s. I watched the first two or three seasons and then stopped. Over the past year I started re-watching online and saw some of the later series. I've stopped watching again for the time being.
I think Pokemon was very popular when it first came out, and then like all things went out of fashion, and anyone who like it was considered geeky. Since the popularity in the video games, however, the Franchise has taken off again, and I think it is popular/cool once more. I collect the cards myself, and prefer the card game to the cartoons. My favourite pokemon is Gastly, but I have an overall preference for grass types like Venasaur. I think they have made too many to be honest. The first two or three generations were fine, but then the creatures started to become a bit same-ish or weird.
Of course Pokemon is still popular. I don't actually understand it myself, and none of my friends at school were ever really into it, but I've been at uni for 2 years now and I've met more people obsessed with Pokemon than I dare to admit. I definitely did not realise it was still so popular, but it certainly is!