The concept of Shining Pokmon was carried over to the e-Series in the form of Crystal Pokmon in the Aquapolis and Skyridge Expansions, although actual alternate color Pokmon would not be seen in the TCG again until EX Team Rocket Returns in the form of Pokmon Star
Like any game that lets you spend real money for benefits, Pokmon TCG Pocket is best approach with some amount of caution and skepticism
Tournament prize cards, staff-exclusive promotional cards, and anniversary editions typically have extremely limited circulation
You won't get to cast a spell from your hand
These changes can be subtle a button color change, a dropdown option reappearing, a store name showing up in the pickup list
All of those are high-powered arguments, though