If there is another Eeveelution, what would be its type? What would be its name? And why wouldn't it have gotten released alongside Sylveon?
If there is a counterpart for sylveon, I think it would depend on what type sylveon is. My guess is as good as anyone else's as to what type that is. Based on looks I'd guess normal and/or flying type (though I doubt both since it is an eeveelution). However, based on name, I'd guess probably bug type, which would disappoint me as I was hoping a bug type eeveelution would look way different from that. Once sylveon's type is revealed, our guesses on the counterpart would probably be more accurately assessed.
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The type counterpart I'd like to see most is ghost type (assuming sylveon isn't ghost type). This would make sense to me if sylveon is indeed normal type (fighting would also make sense. And honestly, I think if they did normal and ghost, they should do a third and make it fighting). Potential names for the ghost type would be (but not limited to):
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ghouleon
zombieon (not likely, but I like it)
haunteon
spookeon
booeon (or booleon, just cuz it makes me think of boolean lol)
spectreon (actually not a favorite of mine, but it's a commonly suggested name)
misteon (though that sounds more like ice or water)
souleon
geisteon
wraitheon (one of my personal favorites)
poeon (Legend of Zelda infringement there haha)
grimeon (might want to double the m so we know the base is grim, not grime)
reapeon
deatheon (totally not likely, but epic nevertheless)
shadoweon
mummeon (though that sounds like a cofagrigus-eevee hybrid haha)
silpheon (reference to 1st gen where silph scope is needed to identify ghost pokemon. Also kinda cool that it sounds very similar to sylveon. Cool, yet possibly confusing if you're not listening closely enough in conversation)
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And I could try to conjure up more, but that should suffice for this post.