It was either:
Finally beating the Champion in Diamond. (I was too young to beat Ruby or Gold.)
Or finally completing the National Pokedex.
English
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Tell me about it, in leaf green i didnt know what i was doing at all at the elite 4. I couldnt beat it with my pokes so i started over and used only blastoise for battles and finally beat the game. Best feeling i ever had was finally beating the rival when he was the champion. Mostly because that was my first pokemon game and i had been trying to beat it for so long, not to mention i was pretty young. Cant wait for moon!