Take out the two Guado Guardians with some powerful attack first. An Overdrive should do the trick. Seymour uses elemental magic in a set order. Use Yuna's Nul-element spells to negate his magic, and then just slap him to pieces with the two other party members.
When it comes to Anima, I really don't remember having much trouble beating her. Just have Shiva heal herself with her ice magic when needed, and use Shield right before Anima attains Overdrive. Use regular attacks for attacking, and save Shiva's MP for healing. Don't bother with Heavenly Strike either, as Anima is immune against the Delay effect of that attack.
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