By the GTS or trading with your friends
Get a kanto starter :p
i do not no
In HeartGold and SoulSilver, she does not battle you - which might be one of the reasons why she doesn't have a starter pokemon. Instead, she has a Marill.
You can't
choose it as your starter pokemon
It's a starter pokemon.
Starter Pokemon at beginning of game
get hart gold then transfer it to soul silver
You can get it as a starter Pokemon or you can trade on the GTS.
Technically Cyndiquil is the strongest but it all depends on what type of Pokemon you want.
In Pokemon Heartgold and Soulsilver you can get a Johto starter from Professor Elm, a Hoenn starter from Steven, and a Kanto starter from Professor Oak
chose one starter Pokemon and beat your rival on hit with a critical.the professor will congragulate you by giving you all three starters