Yes, but you must see Steven in the Silph Co. after beating Red.
Totodile, Chikorita, and Cyndaquil.
There joto staters
chikorita,cyndaquil, totodile
i am sure you can see them but not catch them
only with cheats or by trading
with an AR
only if you trade from pearl/diamond/platinum
toddile,chikorita and cyndaquil
By Ruby I'm assuming you mean the Hoenn starters, then yes, you can get one of three of them in HeartGold/SoulSilver
yes but only by trade
you can only get one starter at the start of the game. if you want the other two starters, you're gonna have to trade with someone who has it
If you have a friend who owns Platinum, Diamond, or Pearl ask to trade with them.