Pokemon was really huge in the late 1990s.
Card games, portable games and of course the anime that was running.
I remember watching the anime every morning (even the re-runs), I remember I became so obsessed with Pokemon one time that I even got a demo cassette from a special event at class (where we get points for doing something good or having good behavior), I wasted all my points on a 3 minute demo video of Pokemon
.
Afterwards I got into Pokemon (gaming) through my purchase my GameBoy Color and into the card game (not as much as the actual video gaming).
Ever since that time, every single portable Nintendo system I purchased, I always purchased it with a Pokemon game!
GBC = Pokemon Yellow
GBA = Pokemon Ruby
NDS = Pokemon Diamond