This is the data sent when a user deposits a Pokémon.
Created from this base64 urlsafe string:
(deleted)
I had to remove the last C to decode it properly; nicholas, I think the string you posted was cut off in IRC, so I didn't get the full thing. Could you post the string in this thread?
It's little endian like everything else. It looks like the GTS Pokémon data starts at 0xF8 (National Dex ID, gender, level, requested Pokémon data; pretty much the same as what's specified here with Grovyle's offsets). I believe the actual Pokémon data is encrypted, though. What's odd is that it's ~345 bytes, which is much larger than the data sent in gen 4.