I'm not really surprised to see that rain continues to decrease slightly every week. To be honest, most of the rain teams I have either seen or played on PO are very basic / general, and a good player should have counters to it and know how to beat it. That being said, I still feel that a rain team is very viable as long as you know how to beat its main problems, such as bulky Pokemon (ie Cresselia), Thunder Wave (ie Thundurus, Cresselia), other weather (ie Abomasnow, Tyranitar, Sunny Day from random Pokemon), and other rain teams. I've stressed this in many threads but most people think rain is an autopilot kind of team, "Oh, I'll just lead with Politoed and Ludicolo every game and Surf/Hydro Pump everything into oblivion." Obviously, it's not true but the fact that rain is starting to see a decrease is still pretty interesting.
It may be that I haven't been paying that much attention to it but I never noticed how high up Jellicent and Infernape were. Personally, I love both of those Pokemon and used them on my fall Regionals team but from most of the games I've played on PO, they were never really used effectively for me to really remember. That or I just haven't really seen many teams with them.
Also, Android users have made PO so much less fun when they don't know what they're doing :/