I'm sure. The Pokemon that appear there are Clefairy, Jigglypuff, Meowth, Chansey, Eevee, Porygon, Cleffa, Igglybuff, Marill, Azurill, Plusle Minun, Castform, Bonsly, Mime Jr., Happiny. Nothing remotely close to a Deoxys.
I was in the GTS, and I was trying to trade a Bronzor. I offered it for a Glameow, I believe. I came back the next night, and the lag was terrible.. I waited and waited. Finally, it showed me my summary screen, and said I had put in a Jumpluff. I was kinda scared (because I had just gotten wireless internet), and I didn't know what to do. So, I took it out, but the lag got me again, and it booted me out. I went back in, and it was a Bronzor again. Kinda wierd.