Fastest way to get seal crystals?

Im planning on saving till (hopefully) there will be a rerun of L80 Remi (or something interesting) Which I guess will be in april next year (since thats when it happened this year). How my resources do I need to get to guarantee to get her? Yes im preparing early, i didnt know this year and missed out. (Not like i had any seal crystalsbut you get the point)