If my opponent has a Robo Substitute on the bench, does that add 20 damage to Exeggutor's "Shake It Off" attack?
Yes, Robo Substitute counts as a {C} Pokemon while in play.
Source: Roaring Skies FAQ (2015-05-07), TPCi Rules Team (2015-05-07)
If my opponent KO's my Active "Robo Substitute", would I get the extra benefits from Terrakion's "Retaliate" Attack or Toxicroak's "Revenge" Attack?
Yes, you would. Even though Robo Substitute does not give up a prize card, it still counts as a KO'd Pokemon.
Source: TPCi Rules Team (2014-12-04)
I am playing a Robo Substitute from my hand to my Bench, but my opponent used Venomoth's "Dizzying Wind" attack last turn. Do I have to flip to play it?
Yes, Robo Substitute is a Trainer card when it is played.
Source: Phantom Forces FAQ (2014-11-13), TPCi Rules Team (2014-11-13)
Can you use Target Whistle on an opponent's discarded Robo Substitute?
Target Whistle says that it can bring back a Basic Pokemon card, but the Robo Substitute in the discard pile is a Trainer card, not a Basic Pokemon.
Source: Phantom Forces FAQ (2014-11-13), TPCi Rules Team (2014-11-13)
Can you attach Energy cards or Tools to Robo Substitute?
Yes, you can. For purposes of attaching cards you treat Robo Substitute as a Pokemon while it's in play.
Source: Phantom Forces FAQ (2014-11-13), TPCi Rules Team (2014-11-13)
Can you put Robo Substitute on your Bench or make it your Active Pokemon during game startup?
No, you cannot. This is an Item card before it is in play, so you cannot put this card out as a Pokemon when you are preparing for battle.
Source: Phantom Forces FAQ (2014-11-13), TPCi Rules Team (2014-11-13)