Wow... Not much to say about that. Just wow. I wonder if we could make that any bigger, though.
Oh, you could use 12 Plus Powers (4 Plus Power, four Milotics, 2 Herdier, and one Dowsing Machine) for +110 to the base and then Dual Brains Magnezone for two Iris gives +100 more.
Then, you have a Conkeldurr with 55 energy (one is in the prize cards) plus a Giant Cape (so you can use all you energy attachments) at 10 hp. That would be 140+(20x56), or 1260 hp, at 10 hp, which means 125 damage counters. Then Mew copying Tyranitar would do (125x60)+110 base, which is 7610. Then you add the Plus Powers and Iris and you have 7610+110+100, or 7820 damage. Add a Muscle band and you have 7840 damage. Then. hitting for weakness, it does 7840x4, or 31,360 damage.
I think when you did the math you might have accidentally did 60 times the amount of damage on the Conkeldurr, not 60 times the amount of damage counters. That might be why our math is so far off. Of course, it's possible I made the mistake, so sorry if that's the case.