>>44284542>>44284590The design process of RBG was all over the place and many Pokémon like Onix were designed before the idea of gyms, typing, and attacks came about.
Based on design history, Onix most likely had a planned evolution in gen 1. He’s one of the five fully evolved Gen 1 Pokémon which can’t learn hyper beam. The other four are Hitmonchan, Hitmonlee, Farfetch’d and Ditto. All of them received an evolution during the Gen 2 design process.
The night be why Bruno uses Onix in the E4. God Onix slot was originally meant for the evolution, but was scrapped