Not to be contrary, but is focusing on specific bug types really the smartest way to do this? Wouldn't it just make more sense for everyone to catch any bug they can get close enough to? We don't know how many of each bug they released, so ignoring bugs because we're looking for other bugs might be a good way to lose. 500 of anything is a lot to collect, and then making it something that moves makes it even harder, so it feels like something that, at least to me, we should go at as a free-for-all.
That's just my opinion, though, and I'll admit that I don't really have a history of experience working with bugs. I have watched a lot of Black Friday videos though and grabbing everything and sorting it out later isn't the worst strategy.