The best replacement for eevee is marshtomp.

The best alternatives to eevee are rated as following:
★★★★★  marshtomp
★★★★★  lapras
★★★  vulpix
★★  pikachu
★  zorua
★  skitty
★  rotom

Your alternative for eevee is not listed? Suggest!
Speaking about eevee, one probably shouldn't forget about moon stone.

Other search terms related to eevee and their ratings are:
★★★★★ moon stone
★★★★ moonstone
★★ leafeon
You have in mind a companion for eevee and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of eevee in all years. Click on graph for more.
eevee
marshtomp
lapras