The strongest Chesnaught will be the next 7-star Tera Raid in Pokemon Scarlet and Violet. It’ll run from May 12-15, 2023 and May 19-22, 2023. As a note, Chesnaught and its pre-evolutionary forms are not native to Paldea. So this will be our only chance for trainers to catch one this generation unless you trade.
Like other 7-star Tera Raids in Pokemon Scarlet and Violet, the Chesnaught will come with a Mightiest Mark. It will have a rock Tera Type. In previous games, Rollout was the only rock-type move that the Chespin line could naturally learn. So this Tera Raid Chesnaught might know something like Rock Slide or Stone Edge, which are moves that you would normally need to teach via TM.
Chesnaught, which is the final form of Chespin, debuted in Pokemon X and Y as the Grass-type starter. It’s a grass/fighting type and looks like a cross between a giant hedgehog and an armadillo. So far, the only other Kalos starter to appear as a Tera Raid Pokemon is Greninja, which was the Water-type. Delphox is the final form of Fennekin, and it will likely join its compatriots in Paldea later on.
Pokemon Scarlet and Violet are readily available on the Nintendo Switch. The Chesnaught Tera Raid Battle event will run from May 12-15, 2023 and May 19-22, 2023.