On the chat room here: http://pokemondb.net/pokebase/chat Here is where you talk with others about stuff off-topic in general, and trading and battle requests are welcome there. Just don't get steamed if nobody responds, not everyone wants to trade ;)
You may access the chat room from any page of the PokeBase; it's one of the links in the top-right section of the page, below the search bar.
