Diamond Removal

The Diamond Spear cannot really be removed so simply. Either death, the users decision to pass it on, or by the guardian can it be removed.
But lets say if it could be removed.
The Diamond Spear is the reason the Pokemon with it will change colour to a teal/ cyan.

So apparently Latiar without it is just a big eared, normal Latios

Latiar won't be happy when he wakes

Latias, Latios (c) Gamefreak
Latiar, Diamond Spear (c) Me