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If I remember correctly, some of the older event Pokemon in an earlier version of this save file had an OT that was too long for Gen2/3, or was impossible to have (specific English characters on a Japanese event) etc... And as @theSLAYER said, this save file was never intended to have all of the event Pokemon. There are some event Pokemon in here, but nowhere near all of them. There is a save file that has nearly every gen 3 event Pokemon, but I'm not sure if something similar exists for the other generations. The GitHub or PkHex mystery gift database is probably your best bet on that end.