yea showdown is pretty fun. there is usually 10k+ people on ~2k active battles
sometimes i'll build a team but its pretty easy to just click random battle and get straight into it.
just know that if you build a team try to include hazard control (defog/rapid spin) and try to include a pokemon with at least stealth rocks for hazards. they are pretty broken, spikes are decent too.
other extremely strong moves to try to include are knockoff -removes their item. scald -decent power, 30% chance to burn, wears down counters if you burn. thunder wave - cuts speed by to 1/4th and 25% of not being able to move. willo-wisp - cuts enemies physical attack by 50% and does 12% a turn
not sure how experienced you are but i can give you more tips if you want.
This post was edited by Harua on Aug 9 2016 11:21am