What is the fine-grained topic of the following text: The brands have chosen to keep much of the collaboration a surprise, but we can confirm that at least seven designs have been created based on the fan-favourite Generation 1 Pokémon Charmander, Squirtle, Bulbasaur, Jigglypuff and – of course – Pikachu! Only return the topic.
Collaborative creation of designs based on Generation 1 Pokémon characters.