Calm Mind: Allows Raikou to be better offensively and defensively.
Shadow Ball: A useful move to take own all those Ghost and Psychic foes.
Thunderbolt: Raikou's best Attacking option.
Substitute: Blocks status and allows for easier set-up of Calm Mind.
HP Grass is a better option than Substitute, but you don't have it. HP Ice is also nice to deal with Grass types in addition to Ground types.