You have to kill the Gigginox( Posion spitting troll) and carve it off him but the chances of getting it aren't a high percentage I guess for the carving. Have fun with It. >:3
You can get it from Gypceros.
Red Khezu G rank.
Budroths. You can harvest them Budroths and Royal Budroths and you can get them as an a reward in Royal Budroths or Budroth hunts.
Jellyfish from area 10 in Moga Woods, of other "fish", but its jellyfish which are best to try and get it off
Wherever you want it to hide.
JellyFish Found in area 11: Moga Woods PS: Must be killed with harpoon so the jellyfish can be carved.
From any high ranking Giaprey Hr4+ they dont have to be the main monster sometimes if you hunt down the Giadrome you get one in the rewards screen. Happy hunting!
Spongy hide plus[+] is from a expert rank quest for ex. if your online and is a hr 32 or higher and kill a royal ludroth on expert rank quests you will have a 45% chance of getting a spongy hide + from carve.
good weapons are hard to define in monster hunter. Many of them have their ups and downs. Even weapon type matters. Hammers are better for monsters with tough hide then longswords or dualblades etc. You can find a list of all the weapons,their stats, and how to make them at www.gamefaqs.com
fight a khezu dont fight the red one it gives u alluring hides flabby normal rank quests will give u this :)
kill a velociprey and carve (press "o") on it's dead remains. velociprey are those velociraptor looking thingy roaming in the jungle map.
velvety hide can be carved off of gigi the small worm like monsters found in the deserted island area 4 or moga woods area 4 but are semi-rare so require some time to collect