Ideas for attaining and using Legendaries in the TPML.

Legendary Pokémon are only available in the Safari Zone, during certain times of the year.

1)Only one of every Legendary totally
-There are NOT two Mewtwo's for example.
2)Can only be Caught with an Ultra Ball
-They're legendary! Duh!
-However I do like Hypno's idea of needing a special Ball after defeating the Gym Leaders before going hunting. Probably a Master Ball without the high-catch ratio, the Legendary still needs to be battled and weakened in order for the ball to work.
3)Only one Legendary on a team.
-While it's tempting to have multiples (I would like two, specifically), I think a single Legendary on the team will help stop everyone from having multiple Mews, Celebi's, and Azlef's. (Although a Rayquaza would be cool... ^^U)
4)New Areas in the Safari Zone
-Some Legendaries may show up in specific areas, while others could show up... ANYWHERE! But we could have some new zones open up because of...well, a lot of people exploring it.
5)Rarity
-Legendaries show up depending on time of year
-Migratory
- Make it a specific yearly event where the Legendary shows up for about a week in the Safari Zone depending upon what seasonal event that legendary would be tied to (New Years for Jirachi, Anniversary of TPM or TPML with Celebi, Winter solstice for Articuno, First day of Winter for Suicune, ect...)

Just my suggestions