my legendarys and rare pokemon for your shinys

[boomshackalaka2]

my friend code is on the left and i wont take shinys that i already have the legendarys i have consist of one thundurus ,one deoxys, one tornadus ,one cobalion, five zygarde ,three landorus, two xerneas, two kyurem, two regigigas, four yvelta,l two giratina, two rayqauza, and two eleciveres along with a few perfect iv beldums

[Jhinsuu]

i got a shiny deoxys level 100 and has 3ivs what can i get for that 1 or 2 legendaries?

[boomshackalaka2]

three pick any buddy

[nest4321]

can you give me info on the regigigas

[boomshackalaka2]

regigigas level 50 hp 175 attack 152 defense 131 sp atk 110 sp def 115 speed 120 nature modest
regigigas level 68 hp 245 attack 237 defense 145 sp atk 126 sp def 168 speed 161 nature hasty