I know somethings about this Pokémon. I would consider it to be the hardest to beat Gold & Silver with because it is a Grass type Pokémon and the first to Gyms are with Flying Pokémon and Bug Pokémon. And Grass has a disadvantage to both Flying and Bug. Chikolita is harder to start with than HINOARASHI or WANINOKO.
Here is a (jap.) picture in the Pokédex.