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I'm throwing out GF's postgame junk, and working to get all of the Ribbons. That kind of stuff entices me a lot more, since it's legitimately challenging.
All I do is breeding nowadays. I like the practice of breeding two Pokémon and looking at the result's Egg Moves. For example, my Dratini in White has Dragon Rush.
After beating the Champion, I do the Post-Game (If there is one) and then I try to catch all the Pokémon and find shinies, until I get bored and leave the game :/