Sinnoh is home to many Pokemon that are rock bottom in my list. Most cross gen evolutions cause some have grossly bloated designs, some are unnecessary, people keep asking for more cross gen evos every generation, some pokemon just need stat buffs, and other reasons too (except Roserade, Froslass, Gallade, Magnezone, the eeveelutions, Porygon-Z). Weirdly enough I have no problems with non cross gen Sinnoh pokemon, except Riolu/Lucario, some legendary pokemon like the Lake Guardians, the creation trio and Arceus, I just don't like their designs and their lore, Darkrai for being a edgy pokemon that was popular with the kids at least when Gen IV was new. Nothing wrong with liking them though. i also have a problem with the large amount of legendary pokemon too, similar with other regions like Unova, Alola, and maybe Hoenn.