Pinkie Pie decided she wanted to become an Alicorn.
Stage One. Pinkie needs to get her own wings. She already pre-ordered her brand new jet engines.
Stage Two. Pinkie needs to get her own horn. Now, where would she get zero-point energy manipulator?
Stage Three. Pinkie needs to amaze the Princesses with her own accomplishments.
Stage Four. Pinkie needs to challenge Rainbow Dash to the race.
Stage Five Pinkie wants to provide other ponies with medical care.