Normal Game Grinding
As soon as possible synthesize one Gold Orb (and equip it on anybody). As you accumulate enough Gold, synthesize 3-4 Experience Orbs. You can equip 2 Exp Orbs on Anemos. Now just play through to the Normal End. (And P.S. Save all your Gold Flowers and Experience Flowers for later.)
Also collect every Treasure Map throughout the game (on both playthroughs!)
Give all your Strength Drops to Laminah and either give all SP Drops to Cynthia, or split them between Cynthia and Laminah.
New Game+
As soon as you enter the Kreisian Abyss and Anemos has learned "Savage Blessing," you can do quite a bit of easy grinding.
In every battle - random encounters and Bosses - use 1 Gold Flower, 1 Experience Flower, and have Anemos use Savage Blessing. (If I've read all Azyleo's notes correctly, the Flowers and Savage Blessing are stackable, so you'd get... 4x Gold and Exp, plus 50% from the flowers, plus whatever bonus from whatever # of Orbs you have equipped.)
Then when you've done all that, have Laminah use Grand Slash to destroy the enemies.
In very short order, on Easy difficulty, I've used this strategy to go from level 69 to level 99 +9 - and I'm still on the first two screens of Kreisian Abyss!
Mwahaha...
