I haven't had much trouble at all getting HA Pokemon off GTS. You can easily disable all the "special Pokemon" requests from showing up, people are usually good about labeling HA Pokemon (especially since it's usually the selling point,) and I can always find a couple of people offering lvl 1s for a fair-ish trade. You just have to know what "tier" you'll likely have to pony up for the specific HA Pokemon.
Edit: just tested it. Looked on the GTS for a Dratini, lvl 1-10, no special Pokemon, found a Japanese guy offering one for a lvl 1-10 Cubone, and the offer had a bunch of writing that wasn't repetitive (Can't read Japanese). I had one lying around from Wonder Trading spitbacks, so I made the trade. Hidden ability, Extremespeed, and three other egg moves. Give the GTS a chance before you bash it. And Wonder Trade off all your breeding rejects and you will usually have a good core of random mons to trade off. Just watch out for the ones claiming 6 IVs. They're usually lying.
Double edit: if you act now, there's a promising candidate asking for a Scatterbug.
I'm not bashing the GTS, its very useful and a welcome feature to the franchise. I'm just pointing out from my experience some problems with it.
I actually used to use the GTS to trade for a whole batch of Scatterbug/Spewpa when I was trying to complete my Vivillon collection. Its pretty easy to just put one up on the GTS asking for another one and get it traded fairly quickly. Sadly after about a hundred or attempts I think I got ALL the Vivillon I'd be able to get, those who have a rare pattern don't seem to want to trade their Scatterbug/Spewpa, instead rather asking for Legendaries for their rare Vivillon. Smart on their part, though sadly it probably means I won't be getting those patterns. Oh well, at least I have the special Vivillon patterns.
Ohhhh, found out about the filter so that it only shows offers for Pokemon you have.
Back to main topic... who else is slightly angry about the fact that Pikachu gets it's own tail/head/whateveryoucallthose for when they are in the grass? I know Zigzagoon get's it too, but Nintendo... can't we just stop with all the Pikachu hype?
That doesn't really bother me, as you said some other Pokemon also got their tails detailed (if I had to guess maybe they wanted all Pokemon to have a specific part of them appear out of the grass but probably realized how daunting a task that was/ran out of time so decided to generalize all the later route catches (as its mainly the early routes that have a detailed part)).
What about the Pikachu worship that bothers me in Cosplay Pikachu. Okay, I get you wanted a Pokemon to show off the Pokemon Contests with it being back and all; but you couldn't have maybe found a Gen III Pokemon? Of course you could say this isn't new, in Gen IV we got a special Pichu with a spiky ear (and while its stats still sucked and could never evolve, I think it had pretty good Pokeathlon stats). But that was for HGSS and Pichu was a Gen II Pokemon so it fit in well without being that noticeable. But here? Now looking through the Gen III Pokemon I can't really pick out one which I would give alternate costumes too... which is why I kind of wished they just let us put on some simple clothing on all out Pokemon. Bows, hats, ribbons, earrings, sunglasses, pretty much what they did for the Pokemon Musicals in Gen V. Sure they probably wouldn't get special moves, but then again maybe have there be a way for Pokemon that win contests to get special moves. Like after winning a Content that Pokemon gets special access to a Move Tutor who can teach them moves that are for the Contest Condition they have a Ribbon for. And of course the clothes your Pokemon is wearing can help sway the crowd in your favor, thus how the two connect as you'll need some clothes to win Contests to have that Pokemon be able to gain access to that Move Tutor.
However at this point I learned to ignore anything specifically referencing Pikachu since, well, it's the mascot of the series of course you're going to see it around a lot. I notice when I see it, but as long as its not directly in my face unlike Cosplay Pikachu I'm okay with it since I mostly shrug it off and move on.
Still don't like the message, "It couldn't be found nearby. Try again later!" How is it fun to run into that message over and over?
Yeah that's a bit stupid. Maybe it meant it couldn't find a special one nearby? If they didn't want you abusing it so easily they could have made it so that it had to recharge after you break a chain, pretty much like the PokeRadar which it had essentially replaced. It would still be able to detect a Pokemon if one randomly pops up, its just the scanning feature which they can handwave away saying uses more power would need you to do 50 steps before using again.