On certain characters I think but I'm not sure who and you can unlock it from chests but I don't know where but here's the melding recipe Fire Dash + high jump Fire surge + aero Fire Strike + aerora
Which one Firaga Burst or Raging Storm cuz firaga storm doesn't exist in the game. Firaga Burst is a really low chance like I'd say around 10-20% and Raging Storm is guaranteed.
You also get one for free from the sticker book. But not sure if that method would add it to the moogle shop to buy more. I'd already melded one. I do believe blizaga and bonding did work