How come the second gym is blocked by team rocket?

In Pokémon games, the second gym is often blocked by Team Rocket as part of the storyline to create a challenge for the player. This obstruction typically serves to introduce players to the villainous team's motives and actions, as well as to develop the plot further. Players must usually complete a task or defeat Team Rocket members to gain access to the gym and progress in their journey. This mechanic helps to enhance the narrative and engage players in the game's world.