John Hay and John Nicolay, both from Pittsfield became personal secretaries to Lincoln when he became President of the United States. Many Civil War era homes still exist in Pike County. In fact, there are more houses and sites associated with Lincoln in Pittsfield, Illinois than in any other place in the country.
Cottonee does not need to reach any particular level to evolve. You can use a Sun Stone on it and it will evolve into Whimsicott! Happy playing :)
Make sure Eevee has a Fairy-type move. Eevee will naturally evolve into Sylveon if certain important conditions are met. The first of these is that the Eevee must know at least one Fairy-type move. You can catch a wild Eevee with Baby-Doll Eyes (Level 19), or use the move tutor to relearn it.