Yes. Here Is A Way It Is Called The [***Masuda Method***.][1] Or You Could Use Hacks And Cheats To Do It Too.
If You Are Trying To Make An Un-Shiny Poke'mon Shiny, Use Hacks. It Will Not Be Cool That Way Since You Bacicly Cheated.
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Hope I Helped U! :) [1]: http://bulbapedia.bulbagarden.net/wiki/Masuda_method [2]: http://www.pokestadium.com/pokemon/sprites/icons/black-white/601.png
Except for Action Replay / Hacks, Absolutely NOT!!!!
You can hatch and catch Shiny Pokemon, but you can't make Pokemon you already have Shiny.
Yes, you can Modify pokemon to make them shiny but that isn't a good idea. it takes out the fun of everything