I just started a new game for 13.5 and I'm only at Gearen still, so I'm not sure if this is a bug or not, but the encounter rates for Pokémon are extremely high. Every grass tile has an encounter and in the sewers every step is an encounter. Its honestly getting to the point the game is unplayable. i do have some passwords enabled but nothing that i have should have an effect on encounter rates in the first place. any help would be appreciated