I've been training speed and attack on route 8 right outside Celadon. Rattata, Raticate, Vulpix, Growlithe, Spearow, Meowth, Persian, Houndour, Murkrow, Bellsprout. Basically so long as you don't take out Abra (Since idk what it gives and it doesn't pop up often, once in 3 days) you're gaining ev's.