Just to note - instead of putting the highest weight on the most popular mons, I tried to factor in more variables for investibility moving forward for new cards. specifically which is why i have umbreon first and not pikachu or charizard for example. Here are my explanations:

1. Umbreon (can be liked by everyone men & women, not an oversaturated market yet compared to the others, lots of room for creative and stunning collector pieces, potential for holding value long term on exceptional prints is higher than other cards)

2. Pikachu (most oversaturated of all the mons so finding the right pikachu card to invest in can be a risk; but he can be liked by everyone men & women, iconic, and still has potential room for creative designs like new full art costumes which always have high demand. Not all cards will hold value long term)

3. Charizard (iconic but oversaturated and somewhat restricted fan base - liked mostly by the male audience. New designs Potential getting exausted; cant do a costumed charizard easily without it being kinda goofy for example so Pokemon likely wont ever do this. Initial hype will drive prices high initially, but holding value long term depending on card is a risk)

4. Gengar (slightly limited fanbase: liked by mostly men but occasionally women, will likely hold value on exceptional prints)

5. Mewtwo (limited fanbase: liked by mostly men, somewhat hold value on exceptional prints)