Mine is Soul Silver. It's such a fantastic remake and the ability to go back to Kanto is just the icing on the cake. After this one, I'd have to say Fire Red and then X.

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My favorites are the Gen 3 remakes: Omega Ruby and Alpha Sapphire. They play really smoothly, the presentation is pleasant, and I love the tropical setting. I think Soulsilver and Black/White tie for second. I also have a soft spot for Fire Red and Leaf Green, but they don't play as well as later games.

I feel like ORAS just streamlined things so much with being able to fly directly to routes and the introduction of DexNav.

Also, I like Pokémon Snap as well. It's such a great concept, one of the few games where I actually went for high scores, the only problem I have is that there isn't much content to it. If it were one of the games I had gotten during its time when it was $50 or so? Yeah, I could see being disappointed with it. But snagging it for $2.99 at a game store? It's amazing for that price. I've always wanted to see what they could do with a sequel, especially on the Wii where the Wii pointer would be perfect for it.