No, but if you catch all the sinnoh pokemon; Prof. Rowan will offer you one of the three Johto starters.
yeah
You have to trade it from the gba series
You can't catch Totodile at all... You'd have to get it as your starter Pokémon in Pokémon HeartGold/SoulSilver and trade it.
You Can Get Totodile By Trading It From Pokemon Emerald Or Pokemon HeartGold Or Pokemon SoulSilver.
you dont catch it you get it as a pressent from oak if you compleat the kanto dex but the truth is cyndaquil is slightly better than totodile
Totodile can't be seen on Pokemon Platinum unless you trade it over from a game where you can get totodile. You can do that in the Pal Park but this can only be done on the D.S and D.S lite.
You need to catch every pokemon in Hoenn and then go see Professor Birch and he will let you have either totodile, chikorita, or cyndiquill.
you cant unless u trade a totodile from your soul silver to your diamond
You can't get totodile if you want one trade croconaw from colosseum then breed it.
you cannot get a ferelagater on platinum but you can if you migrate a totodile from emerald and then level it up to LVL 30.
you cant get them in platinum but you can easily if you use a DS cheat card
Answering "Can you just catch 200 Pokemon on your national pokedex to get chikorita cyndaquil or totodile?" Hell no!