LogFAQs > #930377471

Rillaboom OR Cinderace
Barraskewda - Before first gym if you're patient with fishing (5% chance on Route 2, otherwise in the 2nd gym city)
Toxtricity (Amped Form) - Before second gym
Grimmsnarl - Before third gym
Sirfetch'd - Before second gym

Then one of:
Stonjourner - Late game
Copperajah - Possibly before 3rd gym, more likely before 4th gym
Darmanitan-G (Zen Mode) - Around the 6th or 7th gym I think?

But if you stay connected online and keep your eyes peeled for raids, you can potentially get any of them at any time (except Stonjourner, who I believe is only in 5* raids)
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Change is weird.