If the Defending Pokemon retreats while the song for Imakuni?'s Doduo's "Harmonize" attack is being sung, does that prevent the damage?
No, since the damage does not take place until the song is finished, the opponent's Active Pokemon at the end of the song will receive the damage.
Source: Evolutions FAQ (2016-11-03), TPCi Rules Team (2016-11-03)
What happens if Imakuni?'s Doduo is KO'd or retreats with "Frenzied Escape" while singing for its "Harmonize" attack?
The singing continues and the damage is placed when the song is finished. Just because Imakuni?'s Doduo is not in play doesn't mean its attack stops.
Source: Evolutions FAQ (2016-11-03), TPCi Rules Team (2016-11-03)
When using Imakuni?'s Doduo's "Harmonize" attack, can I just play a recording of a song?
You may have musical accompaniment as long as it is not disruptive, but you MUST actually sing the song. Lip-syncing and humming do not count.
Source: Evolutions FAQ (2016-11-03), TPCi Rules Team (2016-11-03)
When using Imakuni?'s Doduo's "Harmonize" attack, what happens if I forget the words to the song?
As soon as you stop singing, the damage is done to the current Defending Pokemon.
Source: Evolutions FAQ (2016-11-03), TPCi Rules Team (2016-11-03)
When using Imakuni?'s Doduo's "Harmonize" attack, what happens if the song is not finished before my next turn?
No matter how long it takes, the damage placement is delayed until the song is finished even if it takes many, many, many turns.
Source: Evolutions FAQ (2016-11-03), TPCi Rules Team (2016-11-03)
If Gastly attacks with "Little Grudge" and on the next turn is KO'd by Blastoise-EX's "Rapid Spin" attack, does the Energy get discarded from Blastoise EX or from the Pokemon that replaces it? Neither?
Blastoise EX was the "attacking Pokemon", so it loses an energy.
Source: Evolutions FAQ (2016-11-03), TPCi Rules Team (2016-11-03)
If M Slowbro EX attacked with "Loll Roll Spin" last turn, then next turn attacks when it is Confused and flips tails, does it do 130 damage to itself?
No, a failed Confusion flip does not do damage, it places 3 Damage Counters. The 100 bonus damage is not applied to damage counters being placed.
Source: Evolutions FAQ (2016-11-03), TPCi Rules Team (2016-11-03)
Can you do Pidgeot EX's "Mirror Move" attack if the opponent's last attack "placed damage counters" (as opposed to "doing damage")?
No. Placing damage counters is an effect. Mirror Move does not copy any other types of effects from the last attack either.
Source: Evolutions FAQ (2016-11-03), TPCi Rules Team (2016-11-03)
If an opponent's attack damages my benched Pidgeot EX, can it do "Mirror Move" during my next turn and attack for the amount of damage it received while on the bench?
Yes, it can.
Source: Evolutions FAQ (2016-11-03), TPCi Rules Team (2016-11-03)
Let's say I have Machop active with a Focus Sash attached, and my opponent's Mewtwo-EX uses "X Ball" for 360 damage with four Double Colorless Energy and a Muscle Band attached. The Focus Sash leaves Machop with 10 HP remaining. If I then use Ninja Boy to switch Machop with Pidgeot-EX and then use its "Mirror Move" attack, does Pidgeot-EX do 360 damage in return?
Yes, it would. When using Ninja Boy the amount of damage done last turn is remembered by the new Pokemon, so Mirror Move would do 360 damage to your opponent's Active Pokemon.
Source: TPCi Rules Team (2016-11-03)