Also because who doesn't want a charizard?

The charizard evolution tree was used because aside from pikachu (the individual Pokemon) it is the best known Pokemon (including evolutions) so the meme would relate better to everyone and not just hardcore fans, since a lot of people are only familiar with the 'famous' Pokemon

That sounds amazing. I would pay to see that

Thanks for the heads up

Ok thanks so much. First post so i wanna be safe.