You know I mean. That battle you thought you'd lose. That Shiny. That Pokemon you never gave any importance but it proved you wrong. That training that took a lot of time but it was totally worth it.
Mine was waaaay back in Silver, I was finally at the end of Victory Road, Every pokemon but 2 (Thyplosion and one that i forgot) were fainted. My proudly walk soon became fear when I saw my rival coming. I was not prepared nor had saved in a while. Even worse, i was out of any potion or revives (I was very young, ok?) . "I'm dead" i thought.
My first pokemon, the one that i do not remember, won against his first pokemon and badly injured the second. Then he died. I throw my Thyplosion in the scene. "Do it your best", hopeless i told him. And to my suprise, my Thyplosion single-handedly beat all the remaining pokemon, and with two back-to-back crits and surviving with measly 12 Hp (I still remember this, my god). I was overjoyed.
That was my proudest moment as Pokemon Trainer. And yours?