The A-Gear is usually the only gear capable of landing anywhere on the ground or water. However, there a glitch in Edmont Valley that makes you fall from the supply shop. Go in Edmont Valley and land on the exact edge of the supply shop (opposite from the warp gate to the desert). After that, move slightly to your front then turn around. You will fall on the ground. You can even supply from the ground if you left your supply window open, but you cannot move while on the ground in the exterior of the shop.