Do you mean the other starters: Cindaquil, Chikorita or Totadile, if you do, well you can't unless you cheat (see below).
If you mean Bulbasuar, Charmander and Squirtle, i think you have to trade them from red blue or yellow using the time machine that opens once you get the 4rth badge. But I'll try and find out if you can.
If you like cheating and you want more than 1 starter from Prof. Elm watch this:
YouTube.com/watch?v=qe3PF-KyjCI
You can't catch Treecko, because it's a starter pokemon. There's only one in the whole game and if you didn't choose it as your starter in Littleroot you can't catch it later.
You can't catch starter Pokemon in any Pokemon game. They say there are cheats to do so, but I can't find any! :)
The first water type Pokemon that you can get is Totodile which is one of the starter Pokemon.
No you can't catch a Tepig in the wild. You have to choose it as a as a starter pokemon.
From the sprout tower at night.
he's a starter Pokemon. you can not catch starter Pokemon in the wild.
you cannot catch a starter Pokemon you can only trade...hope it helped
You can't catch a starter Pokemon. But to get all of the starters you can trade the Pokemon to another game and restart the game you were playing and get a different starter.
You can't catch him you get him as a starter pokemon.
Trade
you cant
Tododiles aren't naturally occurring Pokemon (ie you can't catch them in the wild) The only way to get them is, 1)In Pokemon gold/silver/crystal as a starter Pokemon 2)In emerald after catching all Pokemon, talk to professor birch
You cant catch Articuno in Pokemon Crystal, only in Blue, Red and Yellow. But i am not sure about that.
You can't catch any starter pokemon in any pokemon game. But you can trade them online via GTS.
no.
You can only catch Zapdos in Crystal by cheating. otherwise it is not in the game
no only 1 starter