The game is balanced around the EXP Share being turned ON at all times. Disabling it is not recommended as it will leave you severely underleveled for boss fights. Quality of Life Enhancements
Many Pokémon receive significant buffs to their base stats or even new typing. For example, Politoed becomes Water/Normal with a higher base stat total, and Midnight Lycanroc shifts to Rock/Dark. Pokemon Photonic Sun Rebalanced
Pokémon Photonic Sun Rebalanced: The Ultimate Alola Challenge The game is balanced around the EXP Share