explosion shuckle

explosion shuckle

I have 5 questions,1st,if during the battle tower,only my final poke and the oppoment's final poke is left(both at full hp)mine use explosion,and finished the oppoments poke,who will win?2nd,if I equipt focus sash to a meta gross for example,does metagross focus help it to endure it's explosion that it uses if it use explosion when full hp,3rd;is the move explosion powered doubled?4th;can explosion hit the move fly,dig,bounce,dive,protect/detect or shadow force,5th,if I use this crazy combo my friend told me on shuckle,does it work,first use tyranitar and swap it to a poke that learn both baton pass and cosmic power,then after maximing the def and sp.def,use light screen and reflect,then use baton pass to swap to shuckle,make that shuckle equip light clay and it's approx def would be 600(original def)times 3=1800(due to max def) times 2=3600(due to reflect),and sp.def is same except that it is times 1.5(sand storm),thus making shuckle sp.def 5400,does it work?thanks for anyone whom help