Son of Shadoo, I'll take it in:
Arena: Wasabe Desert (Yes, I do like the taste of wasabe, don't hate)
Field Type: Ground/Rock
Format: Singles, Doubles
It's a desert. There are cactuses (or is it cacti?), plenty of soil to dig into and Sunny Day is always in effect. There is a slight chance that a Sandstorm will occur (40% chance), and when it does, it lasts for a furious 5 Rounds. Water Types do not thrive in these conditions, thus have a 5% chance that their attacks fail (Water type moves, that is). Ice Types are even less suited, so they have a 10% that their attacks fail (Ice type moves, that is). Water and Ice type attacks are nerfed by 1 Damage in this arena as well. Grass and Fire types thrive, so they get a 1 Damage boost to each of their respective attacks (which does not stack). Ground and Rock types receive 1 less Damage (this does not stack) in these conditions.
Cacneas, Cacturnes, and Maractus's all live in this arena. Each time a battling Pokemon get's hit, they may have a random chance encounter with one of each of these Pokemon (10% Cacnea, 5% Maractus, and 3% Cacturne). These Desert Pokemon will use, Absorb, Giga Drain, and Mega Drain, respectively.
If there's anything I missed it's standard.