Would it be weird to see an extremly slow Espy?
Somewhat, but it depends on why its so slow. As most would know, Espeon isn't the strongest pokemon physically. There are most likely three possiblities for a lack of speed and agility in a Espeon. First is if its overweight. Now this probably would be extremely rare, as most pokemon trainers tend to keep thier pokemon in reasonable shape. But It would be wierd to see, not because if its lack of mobility but for the fact I don't think i've ever seen a chubby Espeon...ever. Second, it could of just been born much slower then normal. This would be the most weird to see overall. Lastly, it could be disabled. This would be sad to see, especially if it was crippled mentalily. But pokemon are tougher than humans so thankfully, I guess that would be rare too and somewhat weird.
Ok finished my rant :)