You...don't. Maybe you should learn up a little more, play some of the originals before you play HeartGold. Wow, that's...wow.
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Unless there is a cheat code that allows you to, NO!The only games that you can catch other Trainers' Pokémon in are the GameCube games Colosseum and XD: Gale of Darkness. Even in those, you can only catch certain Pokémon from other Trainers.
You are not allowed to catch other trainer's pokemons on any of the Pokemon games. You may only catch Pokemon from the wild or receive them through other means (events, game corner, eggs, etc.)
You can't 'catch' Venusaur. You can get Bulbasaur from Oak and evolve it twice, or you can do a trade. I know someone who knew how to catch other trainers pokemon, but I don't know how to perform it.
Catching Other Trainer's PokemonNo, you cannot steal other trainers' Pokemon. If you try to (you throw a Pokeball at the Pokemon), the trainer will block it. If you want what they have, you just have to raise your own!
go to walmart and buy a $20. game shark and fight Cynthia and make sure you can catch other trainers Pokemon and catch hers