you get a net with bread inside or fishing rod and put bread on the hook there under the rocks.
In the wild, this would be how they would eat. In an aquarium environment, they are primarily fed pellets or flakes, so they would not catch their food in the same way.
No you can't catch a Tepig in the wild. You have to choose it as a as a starter pokemon.
You cant
You should not try to catch a wild bird, by hand or otherwise. Unless you are licensed to work with and capture birds (in which case you would probably have the correct equipment) you could potentially harm the bird by mishandling it.
After you go to burned tower it will appear in the wild randomly. how you catch it is up to you (personally I would use a master ball)
you can catch mesprit after the championship on the wild >
If its a wild duck...DONTCATCHIT!!!If you catch a wild animal, the mother will NOT take care of it anymore! It will die!
kirlia is not available in the wild. you would have to catch a male or female ralts during a mass outbreak, and evolve it into a kirlia.
you catch it with a poke ball
It is not possible to catch a wild Turtwig on Pokemon Diamond. It is generally impossible to find and catch Starter Pokemon in the wild. This was a mechanic designed to encourage player interaction for trading.
There are THOUSANDS of Garter Snakes in captivity - WHY would you want to remove one from the wild !
No, wild animals belong in the wild.