I really only want to use pokemon I like but I want to be able to win with them too. I see no reason to play if I'm using a pokemon that looks completely stupid and isn't a pokemon (I'm talking about you ice cream). Pokémon that I prefer are most gen 1 pokemon, very few I dislike so I wont even name, houndoom, all eeveelutions (except for jolteon, leafeon being my favorite), steelix, trevenant, there are more but to name all would take a long time.
I tried making my own team based around Zoroark to start with and I figured volt switch and U-turn would be a good idea for the mind games so I went Pikachu, zoroark, blissey, wobbuffet, golurk, houndoom. that's when I ran into the issue of substitute. I tried fighting them multiple times but I only beat them once in my 10 games or so of fighting them.
So I switched it up a bit I don't quite remember my next team but it had a big flaw, fighting destroyed me. So it didn't last long.
My current one that I was trying but didn't succeed at is Pikachu, Charizard, Leafeon, Florges, Steelix, Trevenant. The team looks good when looking at strengths/weaknesses but after trying it I'm still having a hard time dealing with sub. I have roar to deal with baton but that still doesn't stop the sub.
I really want Pikachu and houndoom on my team because they are my all time favorite but as has already been said Pikachu really isn't that amazing. Houndoom (want to mega evolve him) doesn't seem to be useful either. His ability slowly kills me with no way to heal so the sub teams destroy him (which is a popular strategy from what I've been fighting)
Leafeon, Steelix, and Charizard are in 2ed place for what I like. I think Leafeon is just awesome and Steelix and Charizard look awesome. Leafeon seems to be doing ok with the set up I have but still has the trouble of fighting sub. Steelix I've only used to set up my stealth rocks, and Charizard X doesn't seem to be doing to hot.
Trevenant, Zoroark, and Wobbuffet are in 3ed place. Trevenant looks awesome and as a mtg player I loved treefolk, he doesn't seem to be able to do much in my hands though. Zoroark I thought would be cool because of his ability but after hitting with a 31IV attack maxed EV in attack and speed using retaliate (after a friendly fainted) and doing almost no damage multiple times I just gave up on him. I realize his special attack is higher but his attack isn't to shabby either so retaliate should be able to do at least 25% hp in damage to an enemy charizard but it doesn't. Last is Wobbuffet, I thought he would be fun to use but against the people who are can just buff up he's useless. If only destiny bond had highest priority =(
Also although I don't hate legendries I prefer not to use them.