Generally speaking, the top surface as it is covered with a waxy cuticle, the bottom of leaves normally have vein protusions, hairs and stomatic openings
Leaves are shiny on the top side due to the presence of a waxy cuticle that helps to prevent water loss and protect the leaf from pests and pathogens. The bottom side of the leaf is usually duller to allow for more efficient gas exchange with the surrounding environment through tiny pores called stomata.
The cuticle
Epidermis
Plants have tried to minimize the water loss by some adaptations like presence of sunken stomata only on the lower side of the leaf, cuticle and waxy depositions on the epidermal cells, leafless plants (certain cacti), presence of hairs, spines etc.
you find it somewhere out side stark mountain but i cant remember where
The rigid side of the leaf is upper side facing the sunlight. In a dorsiventral leaf this side supports the palisade tissue.
The lower surface of the leaf has the stomata. You can see the reason for this if you cut a leaf in half from upper side to lower side. The upper portion of the leaf consists of tightly packed cells that are full of chloroplasts for taking in light. The lower half of the leaf is made up of loosely arranged cells. This allows room for air to enter the lower part of the leaf through the stomata and contribute carbon dioxide and take away oxygen. The upper surface of the leaf is covered by the cuticle which prevents dehydration, as such the stomata cannot be located or function on the upper surface
because if it were on the top it would be hard for it to breath, like if a human put a blanket over their mouth and tried to breath. the waxy cuticle is on the top, all the water wouldn't be able to even tough the cuticle if it were on the bottom, and the plant would die without carbon dioxide
veins, a photosynthesising region (green), a waxy cuticle on top and a softer side on the underside of the leaf with stomata present (air holes). The leaf is likely to be flexible with no woody parts.
The upper epidermis is responsible for preventing water loss by evaporation. It does this by having a waxy cuticle on the top of the leaf. The lower epidermis has stomata, which allow gases to enter and leave the leaf as a result of photosynthesis and respiration.
you have to get a leaf stone which you can find on the down, right side of the bridge after you pass the weather institute then evolve your lombre. you can also get a leaf stone by getting a green shard and trading it for a leaf stone.