Where To Stream Pokémon Horizons The Series Season 3 Episode 19

Riko's grandmother, Diana, has returned to the ship after a long absence! The new information Diana has uncovered is a way to completely erase Lacrium...!? And, in order to train Riko's Karbou, Riko and Diana will battle each other! How will Karbou fare against a fellow fire-type Arcanine--!?