Aeroma are large, green bird Pokemon. They have feet with two claws on each, and three tufts of feathers on their heads, one of which is cream-coloured. At their waist, there is an orange egg pattern, followed by a wave pattern. Their tails consist of four dark-green leaves.
Aeroma's song seems to have a beneficial effect on any nearby plants, making them grow stronger and larger. Thus, many gardens have radios set up that play an Aeroma's song on loop. This is also where the rumour that talking to your plants will make them healthier originated from. Their molted feathers are covered in a fine oil which can be brushed off to make perfume and other scented products. No two Aeroma's scent is the same.
Aeroma are peaceful Pokemon that generally keep to themselves. When protecting a nest or a young Cheepip, however, they will become highly aggresive to anything they perceive as a threat, and can command trees in an unknown way to use their branches to smack foes. They are very protective, and their health varies with the health of the plants around them.
Aeroma are comparitively rare in the wild, but all current sightings have been in places such as woodlands and rivers where there is little pollution and few predators. Aeroma will never nest anywhere near humans or factories.
Although big, Aeroma are known to be gentle and caring companions. Their voices have therapeutic power, and their songs brighten even the dullest gardens.