First let me state this is a suggestion not request. I just thought of it, it doesn't have to be made.

Okay to start out use a Pokemon Diamond OR Pearl ROM. Then like make a new event like where you have to chase and catch the pokemon. BUT you have to catch three pokemon first before you catch each of these. Like regigigas where you need his before forms. To start use http://bulbapedia.bulbagarden.net/wiki/Zapmolcuno which is Zapmulcuno. Then make a sprite for the three dogs combined. Just thought it was a cool idea.
 
Post additional ideas and I will put them here.

Again this is not a request. I am putting an idea on the internet.
Please say why