This has probably been said many times before, but receiving level 2-3 Pidgey or Fletchling, etc. over the Wonder Trade really annoys me. Sure, I understand that people who are just starting out want some help, and Wonder trading is addictive so people want to just keep pumping Pokemon as fast as they can, but grabbing literally the first, weakest, least useful Pokemon that few people, if any, really want or need is really irritating. At least, that's how I feel about it. If you absolutely must farm the first route with grass patches for bunch of fodder to give away, why not at least farm Scatterbugs? They appear pretty frequently, and are at least easily-evolved into something that more people will appreciate. Personally, I enjoy getting scatterbugs. I like surprises, y'know? ^^
The only thing worse is making up crap nicknames just for the sake of getting past the censors. I can understand people finding it humorous to name a Pokmeon BUTTCHEEK or something, but personally, I don't appreciate crappy nicknames. It ruins the Pokemon for me I just end up releasing that stuff, along with the Pidgeys, Fletchinders, etc. that I can't use and don't really want to pass off. :/