Why does dustox only know harden?

Dustox, a Bug/Flying-type Pokémon, typically has a limited move set in the early stages of its evolution. In Pokémon games, the move "Harden" is often one of the few moves available to Pokémon like Dustox due to their type and evolutionary stage, primarily serving as a defensive option. It reflects the design choice to balance Pokémon progression, allowing them to learn more versatile moves as they level up. Ultimately, this limitation encourages players to explore different strategies and evolve their Pokémon for a broader range of abilities.