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The user changes its typing to one of the following pure types, according to the terrain as following. Note that in Wi-Fi battles, and therefore in all of Smogon's official metagames, Camouflage will change the user into a Ground-type. Fails if the user's type cannot be changed or if the user is already purely that type.
Competitively, Camouflage will always convert the user to the Ground-type. This may have some advantages, for example Starmie can avoid an Electric-type attack in a pinch, but generally there are better ways to spend a turn setting up. After all, you could just use a Ground-type to begin with. Additionally, this move is very poorly distributed; none of the Pokemon that learn this move are especially bulky and none gain any real attacking prowess through changing to the Ground-type. Therefore, though this move may have just a little bit of potential, it should definitely not see any use competitively.
Reflect Type also changes the user's typing, but instead copies the opponent's typing.