Since I normally take Cyndaquil, I add a Pidgey to my team ASAP, then a Geodude, then a Mareep and a Jynx. The 6th memeber tends to be either a HM slave, a Machoke or a Dragonite. Sometimes I use a Kadabra there.
Cyndaquil covers Steel, Bug and Grass as well as Ice while Pidgey line covers also...