MC 1.21.1 vanilla blocks only. Buil...

MC 1.21.1 vanilla blocks only. Build a floating island about 80 blocks across with a Pokemon battle arena at its center. The island is deep forest: dense trees, moss, ferns, undergrowth, dappled light. The arena sits in a natural clearing at the heart of the woods, like something grown into the forest rather than dropped on it. Pick whatever wood, stone and foliage sells that feel. Keep the arena floor flat and completely clear so battles have room, and give spectators somewhere to gather around it. It floats, so make the underside torn rock and dangling roots, and edge the rim so players can't walk off. Light it well enough that nothing spawns. No redstone. Surprise me with the details.