Purchasing first ascent! ...but delaying the evolution bit, if that's still an option.
Talents are Stamina and Magic, Weaknesses are Attack and Defense
Not changing support moves.
Bonus points: Max magic and stamina, save the rest.
Boosting Magic for the shadow move, magic for the shining move, and resistance for the Blacklight boost.
Also purchasing the following moves:
Will O Wisp
Lucky Chant
Hypnosis
Magic Coat