My second to last battle in the first part of the tournament is up, and it features A firebreathing dragon controlled by a teenager kid, versus a teenager kid. They will fight in an arena neutral to them both, but it could presumeably be made into more sand by Gaara, assuming asphalt, rocks and earth can be made into sand by him at this stage (I can't recall).
Red (Pokemon Origins). While Red is on the battlecard, it is his Charizard that will be doing the fighting, specifically. Red himself is out of harm for this battle, and can not assist in any way outside of verbal commands, nor does he have any potions or other in-battle items.
Gaara (Naruto). This is Gaara as he was during the Chuunin exam, and he has no equipment with him outside of his gourd of sand.