Pokémon Let’s Go Pikachu and Let’s Go Eevee mod: Alternate EXP Yield (75%) by Dio Vento (Included in Polished Pikachu / Enhanced Eevee)
This mod lowers the base EXP yield of every species in the game to 75% of its original value, allowing for a more natural level curve than the base game and preventing the drastic overlevelling that normally happens in Let’s Go.
Download Pokemon Let’s Go! Polished Pikachu
Download Pokemon Let’s Go! Enhanced Eevee