Realtalk though I don't play Pokémon nearly enough or even at all competitively to know what the hell I'm doing.
I just play them for the story?... or did at any rate. But yeah when I heard about Shinies first way back when Gold/Silver/Crystal came out I was like "pff yeah just like mew being under the truck hahaha" and then it turned out to be true and "WAIT WHAT!?"... the shiny thing at any rate.
and then there's Pokérus! Which AGAIN I thought was some kinda hoax/joke thing but NO, iT'S REAL and it hAPPENS and you can get inFECTED WITH IT and it's a GOOD THING!?