What is mastery?

ur billboard is for just for mastery crops not signs

a developing skill you may be able to use alter in life; also known as "mock combat"

It's a science olympiad event: http://soinc.org/events/metric/index.htm

Mastery is the commitment to the ongoing evolution of skill and wisdom in an area of thought or activity through practice, contemplation, application and exploration.

If by "mastery gift" you mean "Mistery Gift," then go to any PokeMart in Pokemon Emerald, FireRed, or LeafGreen, and talk to the questionnaire at the counter near the guy. Input the words "link...