Throughout all the Pokemon TV series and movies, and anything else from the same canon/relevancy, what is the sum total of ashs enrollments in any kind of formal training regarding pokemon.
In the new-ish Sun & Moon series Ash enrolls in Pokémon School, to my knowledge this is the only time he formally enrols into any school or long-term training program.
Other appearances of formal education in the anime include:
- The Pokémon Trainers' School where Ash gives a guest lecture
- Pokémon Ninja School where he goes to learn Jujutsu (which doesn't really directly apply to Pokémon)
- Pokémon Tech where Jessie and James went to school
- The Pokémon Summer Academy where Ash enrols in the Diamond & Pearl era. I'd count it, but it's more of a summer camp / summer school thing that only lasts a week (or 4 episodes).