Ok, first point. If you want to build one muscle, you have to build them all.
There are many reasons for this. One, it prevents muscle imbalances. Only training your chest and not your back will mess you up in the long run. Secondly, there is obviously the aesthetic aspect, you want to keep in proportion.
Another point, to all those saying you should do push ups...are giving you bad advice.
The best movements for chest are BB/DB bench, BB/DB Incline bench,...