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I think it will be a Riolu, because thats a popular Pokemon with fans. It would also compliment his team, as well as leave a slot open for an evolution.
But then again, Torkoal was random, so his 6th Sinnoh Pokemon might be random as well.
Scorupi, snover and hippopotas follow a pattern with the team but as already said it could be random however torkoal was not random due to ash needing a fire type.