Octillery became the mascotte of 2020's Octillerink (a drawing challenge based on the famous Inktober) by Pokémon Millennium. I was initially asked to draw Octillery in different poses and expressions, for that to be used in Instagram activities like stories and Q&A boxes. Later, I was told to draw up to almost 30 more Octillerys that would've end up in a Telegram sticker pack (NB: the drawings were turned into stickers by Lorenzo Giordanengo). 
You can find some examples of their uses below. 

Pokémon Millennium Website:

https://www.pokemonmillennium.net/
Pokémon Millennium Facebook:
https://www.facebook.com/pokemonmillennium/

Pokémon Millennium Instagram: 
https://www.instagram.com/pokemonmillennium/

Pokémon Millennium Twitch:

https://www.twitch.tv/pokemonmillennium