2019 is Ultra Prism onwards, 2020 is the February set onwards
Since that Exeggutor is part of the Ultra Prism rotation and Lost Thunder will be in rotation until 2020, that Exeggutor will indeed rotate at the same time as Lost Thunder
Ahh I get it now, I wasn't sure if it specified colourless or if it meant one less energy in the attack cost but I realised it would've been made clearer if that were the case
Every Gen takes a gap year, no Gen has lasted less than 3 years.
It's also WAY too late for a NEW GEN GAME to be revealed. SM are less than 2 years old