The Pixelmon Update is in 4.3 which means it is not in beta anymore . So the server can be updated. I am really excited for it. It has a lot of new Pokemon. I am pretty sure others want to have it updated too. If you want to know how I updated it I went to %appdata% then I clicked on .minecraft then I searched forge I dragged the forge files out. I then downloaded forge 1.8.4 or any kind of forge that's 1.8. then installed it. downloaded and installed Pixelmon 4.3. I hoped I helped and bye!
More to the point though, instead of asking what "sponge" is, maybe you should have been thinking "hold on, I'm talking about updates to the mod, why am I putting g this in the building suggestions thread?" ^.^
Oh and Narwhal, I'll be online from about 7pm GMT tonight, please don't log off after I sort my team out and turn up for a gym battle today like you did last night.