Alright, Alm can use Mila's Turnwheel (which can only be used once normally) and be able to counter some of Asuna's attacks, but Alm, even with his skills, wouldn't be able to deal enough damage with Asuna's Mid level regen, my argument for Lucina beating Asuna was that she would win with high diff just because she had durability negation and greater experience, Alm's only good skills are Aegis and Sol, the former rendered useless against a melee attacker, and the latter only healing Alm at a Low or Mid-Low level
Asuna wins with low-diff