About This File
Ahiru's Wonderland is apparently an infamous site that hoards event Pokemon from Japan, back in Gen 3 days.
Relevant screenshots of the page will match the relevant save data uploaded.
Jan 1, 2019 edit: @shadowofdarkness shared some files he downloaded, probably back in 2007.
Interestingly, it went beyond Gen 3, and contained various Gen 4 files.
Do note that:
1. .stk files are a bulk batch of files used with pokestock
2. There appears to be some files being marked (with Pokerus) in the saves, use at your own risk.
What's New in Version 1.0.2 See changelog
Released
Fixed: In the Palcity folder of the 2007 package, Osaka-2 has a .NDS file, that apparently was actually a .SAV file.