Outside of the volcano is big open field of burn rocks, Also there is a dock on the right edge of the island. Inside the volcano holds the Red Magma Stone.
After a big sucess of collect the Green Forest Stone in the Illusion Forest. Victor and his party heads to Mt. Ruby to find the Red Magma Stone for Lysandre. Once the party reaches the island. There is a mysterious cave leading into the cave. One of Giygas's Henchmen: Arlon already made it to the volcano to steal the stone for the evil purposes. Once the group heads to Arlon, The battle begins.