One of the most popular topics on the forum. Here’s a selection of similar threads from the past year and a half. Enjoy 
www.elitefourum.com/t/5-favorite-pokemon-cards/30407/1
www.elitefourum.com/t/why-is-your-favorite-pokemon-your-favorite/30371/1
www.elitefourum.com/t/what-is-your-absolute-favorite-pokemon-card-of-all-time/28425/1
www.elitefourum.com/t/whats-your-favorite-pokemon-of-each-type/28525/1
www.elitefourum.com/t/what-are-your-least-favorite-pokemon/27587/1
www.elitefourum.com/t/who-is-your-favorite-pokemon/27447/1
www.elitefourum.com/t/what-is-your-favorite-pokemon-for-each-generation/26818/1
www.elitefourum.com/t/favorite-pokemon-card-arts-popular-and-unpopular/32560/1
www.elitefourum.com/t/what-are-your-three-favorite-arts-of-all-time/32102/1
www.elitefourum.com/t/favorite-6-of-each-gen/31303/1