you can choose between cyndaquil, chikorita and totodlie at the start of the game. you can't ctach them anywhere else.
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cyndiquil
You can catch Slowpoke in Pokemon Gold in the Slowpoke Well that is by Azalea Town and you can also find them in Tohjo Falls.
in order to get a Typhlosion on d/p, you would have to have a copy of any second generation game(gold/silver/crystal) and have traded your cyndaquil/any evolution of said cyndiquil you want to a copy of any third generation Pokemon(aka ruby/emerald/Sapphire) you can then go to palpark and transfer the cyndaquil/any evolution of said cyndiquil plus 6 other Pokemon to your d/p game to catch. why you can't just transfer from the second generation, I don't know, blame the programmers
In the water
In Pokémon Gold, you can catch Gligar in Route 45.