Blissey: Blissey is the evolution of Chansey, which can be found in Cerulean Cave or in a few routes in Kanto. It evolves on happiness, so keep it in your party for a while and check to see if you can evolve it or not.
Delcatty: Delcatty is the evolution of Skitty, a 3rd gen Pokémon of an adorable kitty. You can find a Skitty outside of Rustboro City, on the route near the Rusturf Tunnel