With the high degree of randomness prevalent outside of booster boxes, the cards known to be the least common (the seven ultra rares) dont all appear the fewest times in the sample
Charmander is from the Base Set
While there is something to be said for having to commit to certain types, its a bit unfortunate that its taken to the degree where dual-type decks can feel awkward and triple-type decks, while allowed, require very specific cards or a lot of luck to pull off
If you do, it will just be a 0/0 Shapeshifter with changeling, and unless another effect is increasing its toughness, it will be put into its owner's graveyard
I hope you learned something from this article and it inspires you to delve into the world of Pokmon cards or even consider other places you can learn about design
Graded Population Report: Krookodile #113 Visualize the distrbution of grades in the chart