To promote Pokémon Let’s Go, The Pokémon Company and Nintendo designed a custom branded emoji that was triggered when the #PokemonLetsGo hashtag was used on Twitter. The emoji is no longer available on the social media platform. It was of a Poké Ball design, complete with the iconic red, white and black colors to make the entire shape. This was among the countless efforts used to promote Pokémon Let’s Go Pikachu and Let’s Go Eevee, which are now available for Nintendo Switch.
Source: @Pokemon on Twitter