Of course I do :) I've sent a level 35 female seaking this time, and I've changed the message to Oathkeeper.Realizing I need to start organizing the way I sort through these a bit better on the next go-around. Think I got everyone, but check GTS and let me know if I didn't quote yours below.
Sniped, looks like. tjohnny44, looks like PJ_Graphix already answered your question, but yes, multiple requests are fine! In the case of the nickname message, it doesn't matter too much when it's the only one of that Pokemon I have; I made it a general rule just so it would be less to keep track of. I haven't gone as far as ignoring people's requests for breaking the rule, but you want my life to be easier, right?