There are three ways to be Chikorita,
First, You could take the test at the very start of the game and become Chikorita, or You could make a chikorita your partner,(and this 3rd part goes nearly for the same) You could also recruit chikorita in mystifying forest, and make it/partner the leader. Then you would either be chikorita, or playing as one.
chikorita
Yes
you have to get the calm type!
Munchlax, Skitty, Meowth, Mudkip, Totodile, Piplup, Squirtle, Bulbasaur, Chikorita, Treeko, Turtwig, Charmander, Cyndaquil, Torchic, Chimchar, and Pikachu
keep trying the personality test
in explorers of time and darkness: Mudkip, Treecko, Torchic, Squirtle, Charmander, Bulbasaur, Chikorita, Cyndaquil, Totodile, Piplup, Chimchar, Turtwig, Pikachu, Meowth, Munchlax and Skitty. In explorers of sky: all the Pokemon of time and darkness plus Shinx, Vulpix, Eevee, Bidoof and Riolu. P.s Meowth and Munchlax are only partners in sky not as hero
havr lots of reviver seeds and use stuff like razor lear or flamthrower
Chikorita is a Grass type pokemon.
Chikorita is calm and quiet. go to http://www.serebii.net/dungeon2/naturetest.shtml and there you find how to answer the questions to be calm and quiet
The main difference between Pokemon Explorers of the Sky and Pokemon Explorers of Time is that Explorers of the Sky is an enhanced version of Explorers of Time. Explorers of the Sky includes additional features such as new storylines, characters, dungeons, and Pokemon compared to Explorers of Time.
You can get Chikorita in Pokemon Gold, Silver, Crystal, and Emerald.
Most of the time chikorita is a male, having a 7/8 chance of being a male when you pick it as your first pokemon. This is also the case with all the other starter pokemon.