It was my absolute favourite media franchise as a kid and also one of my favourite gaming ones once I started playing the games, but it hasn't been one of my absolute favourites (today I'd still have trouble picking a single favourite franchise anyway) since gen V. As for individual games, I did spend a lot of time back then on FireRed, Emerald, and especially Diamond, but none of the three are any close to my gaming top 10 (again I don't think I could ever give a particular order for them), perhaps the only Pokémon game that'd make the cut is HeartGold/SoulSilver.