Johto Starters are the starter Pokémon belong to region of Unova. There are three starter Pokémon.
As mentioned above Chikorita is aPokémon with ability Overgrow.While Cyndaquil is a Type and Totodile is Type Pokémon.
They first appeared in Pokémon Gold and Silver where Professor Elm allows player to choose one of them.The rival of players steals the starter stronger against Player's.The same situation was present in Pokémon Crystal.
In the remakes,Pokémon HeartGold and SoulSilver,starter receive the redesign.Now the starter can follow the player by walking behind them.Player can check their happiness.In this version too Professor Elm gives player the same starters.