Probably the best thing about this gen is that it was the first with every move being separated between physical and special, there's also a lot of great pokémon, Infernape is my favorite fire starter and Empoleon is awesome too, Luxray is probably my favorite electric because of it's design and is also very strong, Floatzel is cool and was decisive for me to me to finish the elite 4 without grinding due to it's speed, Staraptor is my favorite Normal/Flying, and there's others i didn't used like Gallade. the Elite 4 is also challenging and Cynthia is probably the best champion. But i thought Sinnoh was the weakest region besides Kanto, the atmosphere and towns aren't memorable, and the progression is slow, the story is also very stupid even by pokémon standards and there's a lot of dialogue, poketech is whatever, and you're basically forced to have Bibarel in the sixth slot because you need HMs all the time, so i used Giratina for Elite 4 to have a good slot and that's it. Also Lucario is the coolest pokémon in this gen besides empoleon and you only get it by the endgame, don't know why. The OST isn't as memorable as the 3rd gen, but there's some great themes like Cynthia. So far my least favorite pokémon game alongside FR/LG, but it was fun beating this after having to stop it close to the ending due to technical problems 3 years ago