The first generation Pokémon have more basic designs, but basic means classic in this case rather than uninspired or oversimplified. The first of 151 Pokémon from the Indigo League episodes are a perfect entre for the wide-encompassing series. Some Pokémon are as powerful as the sylvan creatures they're based on, and others have world-shaking magical powers.
Source:https://www.cbr.com/pokemon-best-from-indigo-league-ranked/