I should probably elaborate on the generations for people not super familiar with the series.
Pokemon generations are defined by their introduction of new Pokemon, new moves, and a new region, along with the occasional remake of a previous generation’s games.
Generation I is Red and Green (these versions never made into America), Blue, and Yellow
Generation II is Gold and Silver, and Crystal
Generation III is Ruby and Sapphire, FireRed and LeafGreen, and Emerald
Generation IV is Diamond and Pearl, Platinum, and HeartGold and SoulSilver
Generation V is Black and White and Black 2 and White 2
Generation VI is X and Y and OmegaRuby and AlphaSapphire
Generation VII is Sun and Moon (so far)
My favorite pokeyman is Sudowoodo, a big doofus who pretends to be a tree.