However, there are a few things to note:
* Fan-made projects: There are many fan-made projects that attempt to mix the two franchises, often in the form of mods or ROM hacks. These are not official games and may not be available for download due to copyright issues.
* Crossovers: While no official game exists, there have been instances of crossovers between the franchises. For example:
* Sonic the Hedgehog and Pikachu appeared together in the Super Smash Bros. series.
* Sonic and Pokémon characters have appeared in various promotional events and merchandise.
So, while there's no official Sonic and Pokémon game, the idea is popular enough that it's been explored by fans and even acknowledged in official crossover situations.