Go to Rustboro City
Enter the Devon Corporation building
Go to the top floor
Talk to the Devon President
Have at least 50 Pokémon in your Pokédex
Receive the EXP Share from him
Go to Rustboro City
Enter the Devon Corporation building
Go to the top floor
Talk to the Devon President
Have at least 50 Pokémon in your Pokédex
Receive the EXP Share from him