There aren't too many rules at the moment, you can mostly just do whatever, as long as you don't grief anyone and are fairly respectful. Biomes O Plenty is also required to play on the server, not just Pixelmon. Every other mod/plugin that's added or I eventually add will not force you to download something new! A few extra things we have are bounties, hunt down one of a few select Pokemon and turn them in to receive rewards, competitive missions when 2 or more people other than myself are online (with rewards), Wonder Trade, and a few NPC Boss Trainers that can net you some very useful items. You'll also get access to a few specific commands to make things convenient. If you decide to join, enjoy your stay!