You know? This complaint comes too late, 20 years late, the evolution in anime is not necessarily synonymous with effort, other factors such as the environment, dangerous situations, a moment of frenzy and even the desire for the same pokemon may be the reason of evolution, I give you an example of pokemon that evolved without much training
Ash
Charmeleon -> Charizard
Krabby -> Kingler
Sewaddle -> Swadloon
Goomy -> Sligoo-> Goodra
Misty
Poliwag -> Poliwhirl
Dawn
Poliswine -> Mamoswine
Serena
Eevee -> Sylveon
Mallow
Bounsweet -> Steene -> Tsareena
In addition, Sobble had already participated in a battle against the Flygon in Malvalona, had a focus episode where it fought against the rocket team and learned to take advantage of his invisibility, in addition learned U-Turn