If everyone has em are they really rare?  

 If everyone had em but everyone destroyed em then yes, THEY ARE RARE 

 True 

 Holographic Charizard. If you had that one you were a cool kid. Those were rare.  

 A good friend of mine had/has Holographic Charizard 

 I had 3 as a kid because I won battles and we played for keeps🤷🏽 

 Based on cards I've seen in my own personal life, in use in battles on the playground.

Chansey.

Chansey is fucking rare.  

 Chancey is the cutest Pokémon. 

 And probably one of the most helpful