Buy roar of time and earthquake for 1 deox, and buy blizzard for other, and set them to first moves, you wont have to change moves again and again (it will be quick!)
Now start battle in 3 vs 3
Start off with 2 deo's and any 1 low level poke (All three opponents attack your low level poke, so your deoxys are free to attack and do 1 hit k.o)
1- Use roar of time on spiritomb, and blizzard on rayquaza.. both will go in 1 hit
2- Now comes reshiram and salamence, attack reshiram with roar of time and salamence with blizzard, again both go in hit
3- Finally it's heatran and Zekrom, attack heatran with earthquake and zekrom with blizzard..and you are done and still left with 2 lvl 100 deo attacks with full HP


Posting SS for your ease
1- http://prntscr.com/aakiys
2- http://prntscr.com/aakjng
3- http://prntscr.com/aakke1
And yeah i forgot to add! you will make approx 1.2m in 10 minutes! (if your internet is good)
So all the best with making money!!