So I'm playing White for the first time, and my team currently consists of a Blitzle, Sandile, Tympole, Roggenrolla, Woobat, and Pignite. Came across a wild Scraggy and decided to catch the fucker. Problem I'm facing here is who do I switch out of my team for him?

I want to hold onto Tympole, Sandile, and Roggenrolla for Seismitoad, Crookodile, and Gigalith, but that means getting rid of a pokemon that I rely on for Electric, Fire, or Flying and Psychic moves.

I suppose I could get rid of Pignite and just rely on Blitzle for Fire, it does know Flame Charge after all, but I'm uncertain.