Spider-Phoenix
#ChespinGang
As an achiever, however? Nope. Red is a hell of a lot better than Ash there. Dude got rid of TR quickly. Ash can't even get rid of three of them. Ha ha.
Ash helped getting rid of Team Magma, Aqua, Galactic, Plasma and Flare.
Also, it's worth pointing out Red becomes a punching bag as soon as he starts being a NPC (basically, we can go to Mt. Silver and consistently beat him)
Anyway, that's kind of a weird competition since Red and Ash are counterparts. On XY, Yajima went on record to say Ash's clothes were based on Red. There's even concept art of XY Ash with the same pose as FRLG Red