Well, having passed previous examinations, the pony in question must satisfy the captains of both the Solar and Lunar Guard. Traditionally, there would be a ceremonial exchange of blows, to ensure their dignity and poise under pressure. After this, my sister or I would accept them amongst our chosen ranks and confer unto them their enchanted armor.

We are given to understand the process hath changed somewhat, however...the last Lunar Guard induction was a hasty affair, so we hath not yet been able to see the new ceremony in its fullness.