How do you beat elite four in Pokemon ash gray?

To beat the Elite Four in Pokémon Ash Gray, ensure your team is well-rounded with a balance of types to counter their Pokémon. Level up your Pokémon to at least level 70 and stock up on healing items like Full Restores and Max Potions. Utilize type advantages strategically, such as using Water-type moves against Fire-types or Psychic moves against Fighting-types. Finally, have a solid strategy for each member, as they often have specific weaknesses you can exploit.