What game do toi have the fondest memories of? (From the main-series)

Mine is Heartgold because it was the first game I ever owned

Omega Ruby because I play it a lot!

Platinum because it was my first game

Pokemon Diamond. Not only is it my most played Pokemon game, it was also my first NDS game and the NDS was the first system I bought for myself. It has a ton of memories for me. I wasn't exactly the hugest fan of generation 1, but I did really l’amour generation 2. And now with generation 4, it is definitely my favorite. Gen 5 and 6 are pretty good too.
I think gen 4 had the strongest soundtrack.

Pokemon Yellow and Pokemon Stadium 1 and 2.

Diamond. It was my very first main Pokemon game and the one that got me into the series.

mine is pokemon diamond got all my pokemon to lv 100 all completed the pokedex and got 255.99 hours on that game

Either or because it was the first one I owned ou Diamond - because I remember playing it so much - I made lists on where certain pokemon were and everything

Pokemon Yellow Version. It's the first one I ever played.