When Joe wrote that you can do 50 to 3 of your
opponent's Benched Pokemon, he made a mistake cause PlusPower says:
"Attach PlusPower to your Active Pokemon. If that Pokemon attacks and
does damage to the DEFENDING Pokemon,this attack does 10 more damage to the
Defending Pokemon." So PlusPower would do 30 + (4x10) or 70 damage to
Electabuzz, but would still only do 10 damage to 3 of your opponent's Benched
Pokemon. I hope this clears up a confusion about PlusPower.