Might not hurt to either edit saying trade completed or delete the post so people don't offer for a completed trade.
I hope you have five badges BTW; the downside of a Lv.51 Wingull is that it won't obey you until then (fifth badge gives for trades to Lv.60). Just realized that. It'll be very handy come the later game events however, and becomes Pelipper right away at Lv.52.
Cyclone