There is no licensed or official releases of the Pokémon Red & Blue soundtrack on vinyl. However, Moonshake have released an unofficial version in late 2015. There’s a series of different pressings.
This is the black vinyl “test pressing” version, which is limited to 100 copies with alternate artwork. 75 copies feature artwork with the Banksy “Flower Thrower” throwing a Pokéball, 25 copies has art based on Banky’s “Girl With A Balloon” but with a Pikachu and a Pokéball instead, and the final 5 copies feature a hand-drawn Pikachu-Homer Simpson mash-up.