Chikorita was first known when the Pokemon Gold/Silver games came out. She is
the starting Pokemon in the grass ele
ment.
Chikorita evolves at level 16 into
Bayleef and then into Meganium at level 32.
Chikorita
is in the newest edition to the Pokemon cards, known as the Neo Genesis
cards.
In the TV series, Chikorita first appears when Ash, Brock and Misty come
across Professor Elm in Jhoto. There isn't a real Chikorita, Elm just shows them
a picture of one. In the following episode though, Ash and the others meet up
with a beggining
Pokemon trainer with her first Pokemon, Chikorita. Later in the
series, Ash gets his own Chikorita who has a crush on him and is jealous of
Pikachu.
There is also a mini-movie, known as Pikachu's Winter Vacation, where
Chikorita is shown there (poor Chikorita, all the other Pokemon start laughing
at her).
The first and second Pokemon movies have no sign of Chikorita, but she is in
the third movie. This may mean that she is also in the mini-movie: Pikachu and
Pichu.