Hey Beachbums,
I'm not sure that this is the best Greninja list, but I've gone 39-11 in my last 50 games with it on PTCGO:
##Pokémon - 17
* 4 Talonflame STS 96
* 3 Greninja BREAK BKP 41
* 1 Froakie PR-XY XY138
* 1 Froakie BKP 38
* 4 Frogadier BKP 39
* 4 Greninja BKP 40
##Trainer Cards - 31
* 3 Professor Sycamore STS 114
* 4 Bursting Balloon BKP 97
* 2 Rough Seas PRC 137
* 1 Eco Arm AOR 71
* 1 Energy Retrieval EVO 77
* 1 Super Rod BKT 149
* 1 Professor Sycamore BKP 107
* 2 Random Receiver FAC 109
* 1 Teammates PRC 141
* 4 VS Seeker ROS 110
* 1 Lysandre FLF 104
* 4 Professor Birch's Observations PRC 134
* 2 Enhanced Hammer PHF 94
* 4 Dive Ball PRC 125
##Energy - 12
* 8 Water Energy Energy 3
* 4 Splash Energy BKP 113
So I'm calling it Skinny Greninja because I only run 2 Froakie. And the answer to your question - because I'm sure you're instant reaction is how many times did I prize both Froakies - is twice. Two times in 50 matches I prized both Froakies and took an autoloss. A 4% rate seems a little low to me - I know that there's about a 20 percent chance of me prizing 1 Froakie. I'm not good enough at probability to figure out exactly what the percentage is to prize 2 specific cards out of 60 in 6 attempts without replacement - if someone who reads this does know how to calculate that I'd be appreciative of the formula, but I'm betting it should be a little bit more than 4%.
In 4 of the other 9 losses I started Froakie. I started Froakie 5 times in the 39 wins - that seems extremely low to me - it seems like I should have started Froakie more than 9 times in 50 matches. I know that the percentage of starting Froakie is a little lower than 33% - sometimes you'll get both TF and Froakie in your opening hand - but I don't think it should be 18%. It seems like I should have started Froakie a little more than what I did over this span, and that probably is contributing to the 78% winning percentage.
Also a major factor: I only saw Garbodor 3 times during this range. I have no idea what has happened to Garbodor - I've only seen him 10 times in 147 matches this month. This is a huge dropoff from seeing him in almost 1 out of every 5 matches, the rate at which I've come across him the last 2 months.
So what this deck does allow for is ensuring as much as possible that I'll start Talonflame. There's no question that the deck is better when it starts TF, and that I free up one more slot for another card is icing on the cake (I've got about a dozen cards that are my 61st card).
So if you've wondered about gambling and going with 2 Froakie, here are my results. I'd say it's definitely worth taking the chance.
I'm not sure that this is the best Greninja list, but I've gone 39-11 in my last 50 games with it on PTCGO:
##Pokémon - 17
* 4 Talonflame STS 96
* 3 Greninja BREAK BKP 41
* 1 Froakie PR-XY XY138
* 1 Froakie BKP 38
* 4 Frogadier BKP 39
* 4 Greninja BKP 40
##Trainer Cards - 31
* 3 Professor Sycamore STS 114
* 4 Bursting Balloon BKP 97
* 2 Rough Seas PRC 137
* 1 Eco Arm AOR 71
* 1 Energy Retrieval EVO 77
* 1 Super Rod BKT 149
* 1 Professor Sycamore BKP 107
* 2 Random Receiver FAC 109
* 1 Teammates PRC 141
* 4 VS Seeker ROS 110
* 1 Lysandre FLF 104
* 4 Professor Birch's Observations PRC 134
* 2 Enhanced Hammer PHF 94
* 4 Dive Ball PRC 125
##Energy - 12
* 8 Water Energy Energy 3
* 4 Splash Energy BKP 113
So I'm calling it Skinny Greninja because I only run 2 Froakie. And the answer to your question - because I'm sure you're instant reaction is how many times did I prize both Froakies - is twice. Two times in 50 matches I prized both Froakies and took an autoloss. A 4% rate seems a little low to me - I know that there's about a 20 percent chance of me prizing 1 Froakie. I'm not good enough at probability to figure out exactly what the percentage is to prize 2 specific cards out of 60 in 6 attempts without replacement - if someone who reads this does know how to calculate that I'd be appreciative of the formula, but I'm betting it should be a little bit more than 4%.
In 4 of the other 9 losses I started Froakie. I started Froakie 5 times in the 39 wins - that seems extremely low to me - it seems like I should have started Froakie more than 9 times in 50 matches. I know that the percentage of starting Froakie is a little lower than 33% - sometimes you'll get both TF and Froakie in your opening hand - but I don't think it should be 18%. It seems like I should have started Froakie a little more than what I did over this span, and that probably is contributing to the 78% winning percentage.
Also a major factor: I only saw Garbodor 3 times during this range. I have no idea what has happened to Garbodor - I've only seen him 10 times in 147 matches this month. This is a huge dropoff from seeing him in almost 1 out of every 5 matches, the rate at which I've come across him the last 2 months.
So what this deck does allow for is ensuring as much as possible that I'll start Talonflame. There's no question that the deck is better when it starts TF, and that I free up one more slot for another card is icing on the cake (I've got about a dozen cards that are my 61st card).
So if you've wondered about gambling and going with 2 Froakie, here are my results. I'd say it's definitely worth taking the chance.