4th Generation: Your Best and Worst Moments

I'm sure most of you have had those happy moments where you want to scream with joy, do a victory dance or some sort of joyful celebration, or in your head you go "Woohoo!". Those moments can be beating a champion, finally catching a rare Pokemon, encountering some sort of shiny and capturing it, winning tough battles, acheiving a master rank in a contest, any moment that made you feel pleased with yourself. But then there's always downsides ;_; (I wish they didn't exist but they have to happen). You could of lost to someone at the last moment, KOed something you didn't mean to, something that makes you want to scream and throw your DS at the wall.

This thread's purpose is to discuss the best and worst moments as you played through the 4th Gen games. Moments from D/P/Pt and HG/SS are all welcome here <3. Now what are you waiting for ? Discuss away!