Set Eevee as your Buddy Pokémon
Earn 10 Buddy hearts with Eevee
Make sure it is nighttime in Pokémon GO
Evolve Eevee while it is still your Buddy
If you use the name trick, rename Eevee to Tamao before evolving it once per account
Set Eevee as your Buddy Pokémon
Earn 10 Buddy hearts with Eevee
Make sure it is nighttime in Pokémon GO
Evolve Eevee while it is still your Buddy
If you use the name trick, rename Eevee to Tamao before evolving it once per account