Is partner eevee just better than its evolutions?
Partner Eevee has been an absolute demon for me in classic. I started using it because I'm old and like gen 1 mons the most and wanted a pick up member. But, it's been a complete anchor for me.
It's super strong in the early game with boomburst sweeping trainers. It gets great moves that guarantee status conditions like sizzle slide and sappy seed. It hits like a truck with veevee volley. It can wall eternatus with any stat debuffs if you have the berries and eviolite. And it just reverse swept the A Trainers Test random encounter for me.
I haven't even really messed around with a special attacking moveset, but those look good too.