When to evolve Lampent/Eelektrik (And My Current Team)?

I'm not sure what you mean by when, because evolving is always a good thing to do (unless you want to learn moves quicker). If you mean HOW, Lampent requires a Dusk Stone, found north of Route 10 (you're not there until you get to Opelucid City). Eelektrik requires a Thunderstone, which can be found at: Route 9, Chargestone Cave, Wellspring Cave (Dustcloud), Chargestone Cave (Dustcloud), Mistralton Cave (Dustcloud), Twist Mountain (Dustcloud), Challenger's Cave (Dustcloud), Victory Road (Dustcloud), and Giant Chasm (Dustcloud). Hope I helped!