Cacneas appear to be round, green Pokémon covered in green spikes. Its arms are different, however because of them being straight instead of round. Cacnea's mouth appears to have a couple of black spots on it, forming its mouth. It has eyes deep into its body with carved holes showing black inside of Cacnea. It also appears to be wearing a crown on top of its head. Cacnea also has giant spikes underneath him, forming its feet that function like footstools.
Cacnea has the ability Sand Veil and the hidden ability Water Absorb. Sand Veil prevents Cacnea from being effected by sandstorms and raises its evasion in sandstorms by 20%. Water Absorb prevents Cacnea from being effected by Water-type moves and restores its HP a bit when hit by a Water-type move.