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did they copy Sylveon's look for Dainty Dragonslayer?

http://www.gaiaonline.com/marketplace/itemdetail/10126171

No idea what you're talking about. wink
For more examples check out Not Tomorrow, I Choose You, etc.

Gaia does this with lots of stuff. You probably recognize the inspiration for Galactic Soldier, for instance. Items range from "thematically similar, but still pretty unique" to "yeah this is blatantly That Thing." Some of it treads into sketchy legality, but users eat it up, so... The knockoff train never stops.

You got it. Galactic Soldier is a take on a few different examples of the space marine archetype, but mostly the ones from 40k. Even comes complete with a faux-tyrannid.
Not sure why gaia didn't get in trouble over that one, as GW is very litigious. The design may be just different enough to avoid infringing, or the fact that it's based on more than one property might have given it protection as parody/homage? Realistically, the item probably never made it to the GW radar. It wasn't very popular here on release (not the primary gaia demographic, and that armor color certainly isn't easy to work with), so I guess no one was bothered enough to raise the trademark alarm that time.

Haunter item recently as well. Dragonslayer was very well received; I wouldn't be surprised if we get even more in that style. lol