New Pokémon Scarlet and Pokémon Violet information was announced on the official Pokémon YouTube channel at 6:00am PDT / 9:00am EST / 10:00pm JST on October 14th, 2022! Iono (Nanjamo ナンジャモ), a popular video streamer and Gym Leader in the Paldea region, broadcast another episode of Iono Zone (What is it? TV - DonnaMonjaTV ドンナモンジャTV) revealing that Iono’s partner Pokémon is Bellibolt, the EleFrog Pokémon! High resolution screenshots and artwork from the press release have been added to the Pokémon Scarlet and Violet Imageboard thread.

YouTube Clip - Meet Bellibolt | Pokémon Scarlet and Pokémon Violet

Sources: https://www.youtube.com/watch?v=OkfN-jyEcrI

YouTube Clip - Gym Leader Nanjamo introduces their partner Pokémon Halaberry! What is it? TV!

Sources: https://www.youtube.com/watch?v=IrYtaqFT5rE

INTRODUCING A NEW GYM LEADER AND A NEW POKÉMON DISCOVERED IN PALDEA: IONO AND BELLIBOLT!

Bellevue, WA — October 14, 2022 — The Pokémon Company International and Nintendo have revealed a shocking new Trainer-and-Pokémon duo—Gym Leader Iono and her partner Bellibolt—found in the Paldea region of the Pokémon Scarlet and Pokémon Violet video games.

Gym Leader Iono​

Iono is the Gym Leader of Levincia, one of the Paldea region’s prominent cities, and specializes in Electric-type Pokémon. She’s also known as the Supercharged Streamer, ​having gained popularity online as the host of a show called the Iono Zone.
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Bellibolt​​

Bellibolt expands and contracts its elastic body to generate electricity in an organ that looks like a belly button. The huge amount of electricity generated this way is then discharged from the two bumps on either side of its head that resemble eyeballs.​ Its actual eyes are adorably small and round.

Bellibolt’s Ability, Electromorphosis, is appearing for the first time in Pokémon Scarlet and Pokémon Violet. Bellibolt becomes charged when hit by an attack, boosting the power of the next Electric-type move it uses.
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Category: EleFrog Pokémon​
Type: Electric​
Height: 3'11" (1.2 m)
Weight: 249.1 lbs. (113.0 kg)
Ability: Electromorphosis / Static

Iono and Bellibolt will appear in the Pokémon Scarlet and Pokémon Violet video games, launching November 18, 2022, exclusively on Nintendo Switch systems.

Source: https://scarletviolet.pokemon.com/en-us/news/iono_video/