Stern Lesson, as a Catalog variant, isnt particularly good in Blue/White, but triggering your draw two abilities in Blue/Black, and ramping in Blue/Green make the card better for those decks
Doesn't that mean you shouldn't risk losing it in combat
This card can easily attack as a 3/3 or 4/3 for just 2 mana, and with max speed, you get to copy artifacts for cheapjust icing on the cake
The idea behind it is that it helps you commemorate things like catching an especially rare Pokemon, conquering a particularly difficult Raid, participating in live events, visiting special places, you get the idea
The artist behind EX FireRed & LeafGreen Hypno was Yukiko Baba, who began working on the Pokemon TCG around the time of the Neo Discovery set in 2001