My quest? Finally brought to an end on both fronts.
The first Eevee Friday was on May 26th, 2016. I looked around for a hot minute. Looks like the post,
>>26487104, was totally unprompted. Unless anyone else can show otherwise, I think that's the end of this search. A shame that the OP image didn't archived, but the image that's mocking people for enjoying Eevee did. Ah well.
The other mystery, Flareon, is mostly resolved. The origin post was a reply to someone's favorite Pokemon being Flareon(the original post was some guy being flustered about his Japanese girlfriend going to a Pokemon store and asking him what he wanted, except he couldn't come up with a favorite Pokemon.) That post is here.
>>23148079. It seems he got it from the Favorite Pokemon Picker, and the origin post was from Tumblr. I'm not gonna dig further because there's no way in hell that I'm going to dig through Tumblr to find the very first posting of it, so this'll have to do.
Many thanks to the random anon on archived.moe that pointed out that archive.palanq.win was kickin' ass and had search enabled.
Anyways, have the very first Eeveelution image saved from /ef/. I may dig for some of the other Eevees later, since they still have Deviantart tags on them.
