Pokémon Showdown.

[supersquid64]

I both love and hate these things because on the one side I can make awesome Pokemon that would be difficult to do on the handheld games, but I hate them because I have spent hours creating these Pokemon on my games! :P

Try creating a team similar to those on your games. It took me weeks to get an Aggron with the adamant ability, 31 IV points in attack, full EV points in attack, have the rock head ability, and know head smash. In the league, he saved me a lot.

I have an Aggron with head smash as well, usually I send out my Ninjask with a focus sash and do a couple of sword dances, and get the speed boosts. Then I'll baton pass him onto Aggron who is wearing a choice band or scarf. Me and my friends used to play one another with these teams a lot. :P

That is a good strategy, however by the time you are ready to use baton pass, Ninjask may already be defeated. I tend to try to overpower my enemies right away, rather than power up in battle.

Overpowering is a good tactic. I've used the Ninjask and Aggron tactic on Pokemon Battle Revolution before, beat a guy who had clearly hacked a load of ubers. :P Me I have a load of different Pokemon to choose from. Unpredictability is my way forward, however I tend to pick out of the NU and UU pool instead of the OU pool. Since I prefer to be the underdog! :P I sometimes bring OU's into the fight though. :P