5d6ebcbe_ty_driven_Pokémon_encyclopedia__Reason_for_error
[#] 1 [Description] Event Error [Reason for error] 
Unable to complete an event (talking to someone, etc). This error is also known to exist in normal gameplay if the player has a broken or damaged cartridge. Can be seen in Yellow when finishing the game with 152 entries in the Pokédex.
Glitch - Bulbapedia, the community-driven Pokémon encyclopedia