IMO, a solid, "balanced" standard team is Exeggutor, Chansey, Snorlax, Lapras, Golem, and Tauros. Every pokemon here is capable of paralyzing something, either directly via status or indirectly through Body Slam. It's more physical based than special based so as to always be able to at least threaten Chansey. Three pokemon can explode if an out is needed. Tauros, Snorlax and Lapras are all capable of cleaning up teams if you catch any sort of break, which is a somewhat fair assumption in RBY. I'm not saying this is the best team ever (for many reasons) but it probably accomplishes the goal of being extremely standard and functional.