Season 20 | Episode 19 – A Guardian Rematch! eng-subeng-dub
Aired On :March 23, 2017
Summary
Ash begins training for a possible rematch against Tapu Koko. Sophocles helps out with scientific methods that yields surprising results. Naturally, this arouses Tapu Koko's interest. Tapu Koko challenges Ash and Pikachu with the whole Pokémon school looking on. (Source: Wikipedia)
