Espeon getting boosted EXP

[iPrincey]

So I received Eevee from Bill today, and I evolved it already into an Espeon, I used Pokesav to tweak some things though, but I haven't touched the ID or Secret ID (I think?). So the thing is my Espeon is getting boosted EXP and I personally do not want this, does anyone know how I can fix it? I know it has to do with me not being Eevee's original trainer, but I tried everything and I can't figure it out. I could fix all my other pokemon that started getting boosted EXP after I used Pokesav, but not Espeon.

Thanks!

Also, I'm a complete noob at using Pokesav and "hacking" and all that stuff.