There is definitely something wrong with the shuffling and drawing mechanic...

@Sarutaru I need to apologize. You're right, it's not a deck. I just remembered that there was an overflow glitch at launch where the deck drew cards even when empty. I'm sorry.

It's a little anecdotal, at best, but I want to chime in here.

I just played 5 games in a row where my one-and-only basic pokémon in my starting hand was Crobat V. After 3, I got frustrated. After 5 I closed the game completely.

Let me explain, I have 10 basic Pokémon. It isn't much but it is there. Of those 10, only 2 are Crobat V. To pull Crobat V, and only Crobat V, in the first 7 cards five times in a row has astronomically low odds (obv not impossible).

Being an engineer with a background in software, I decided to do my own analysis.

I built a deck of 60 cards. 2 were "c" to indicate Crobat, 8 were "b" (basic) and 50 were "t" (trainer).

I then shuffled the deck using a pseudorandom number shuffle algorithm.

I then ran that shuffle algorithm 20000 times. Of those 20000 times, only 1600 times did "c" show up in the first 7 cards. That is ~8% chance of pulling Crobat V as the only basic pokémon. To hit the 8% chance five times in a row is a 0.004% chance.

To put that in perspective, you have a 0.006% chance of being struck by lightning.

@rgilbert90 i added mulligans to your algoritm. The chances of opening crobat in an individual game with 2 crobats and 8 other basics is ~10.8%

@Edurandomnumber

Depending on your shuffling algorithm, Crobat V can appear between 8-12% of the time as your only basic Pokémon. This is true.

But I am specifically mentioning that it happened 5 games in a row, albeit with a mulligan or two in between.

After accounting for mulligans, I also did notice an increase to about 10-11% so your 12 isn't too far off.

But out of 20,000 runs, not once did it ever hit 5 in a row where an individual Crobat V was my only basic pokémon--admittedly, the counter reset on a mulligan.

I did hit 4 in a row so if there was a mulligan and then a Crobat V again, that would have technically been 5 in a row one time in 20,000 runs which would have been a 1/20000 chance of happening. Which is that 0.005% so it would have checked out.