I don't spend money

You have to save up for a few months from the shop with adventures or something to pull it. Or you can buy it from the purple season shop, which is lower than Legend.

1. Grind content like Rally Battles and Simulation Monthly Challenges to collect 5,000 batteries. Then, use them in the Star Sign Gacha to pull a Legend Flying Pet. (When a new Star Sign Flying Pet is released, a consumption event opens. You need to spend 5,000 batteries during this event to get the Transcendence Cake, which is essential for transcending Flying Pets. So, you must save up 5,000 batteries before starting. Even after transcending, you'll still need Flying Pet Training Manuals and Awakening Cards. Each Flying Pet requires 50 Training Manuals, obtainable only from the Secret Scroll Exchange or Time Rift. Awakening Cards can be obtained by opening the Time Rift 400 times or by purchasing them for 1200 batteries from the shop.) 2. Equip and use Rare Pets obtained from various events or by purchasing the Monthly Pass. (Rare Flying Pets don't have special functions like 'Exceed,' so they don't require Transcendence Cakes or Awakening Cards.) Even if free-to-play players obtain a Flying Pet, transcending and awakening it takes a long time and a lot of effort.