There are many that I don't like.
The one I dislike most is Cresselia because by then you've already used your master ball on a different pokemon like mesprit and it never stays in one spot.
I also dislike porygon, not catching it but using it, It sucks! It has horrible attacks and almost nobody will trade for it when it has an upgrade so it can evolve!
I also hate blisseys. They have high defence, lots of health, and they keep on healing themselves. They're just a great long waste of time.
Magikarp sucks too because it con only learn two attacks and takes forever to train so that it evolves at level 20.
I also hate Kangaskan and Tauros and Chancey because in most games you have to catch them in the safari zone and that takes FOREVER!
I hate dragonair too, That is because it takes forever to evolve a dratini into it and even longer to evolve it into dragonite. you can catch it in the safari zone, but again, same problem as Tauros and Kangaskan.
Yet another one would be feebas. It is hard to make it have max beaty to evolve into milotic and is worthless if it doesn't evlove.
My final pokemon for now that I hate is Eevee. Sure it gives you seven different evolved form but it takes a while to hatch that many eggs and get Edpeon and Umbreon. OMFG! You have to get friendship at a certain time of day tp do that. Getting friendship itself tades a while, but it has to be day or night for a certain evolution. Not to mention the annoyance of having to level up Eevee at a certain rock to evolve it into Glaceon or Leafeon. That REALLY sucks!

Any pokemon that can learn attract and has the ability to put u under it when physically atacked

Shedinja: Almost impossible to kill.

Abra: Almost impossible to catch

Magikarp: Doesn't learn anything damaging for quite a long time; extremely tedious to level up to evolution.

Mesprit; Cresselia, Latios, Latias: They run away! Just slightly better then Abra.

The 3 dogs in heart gold and soul silver really made me mad. no matter what i did they ran away. Haven't caught them yet as i haven't played the game lately, but i hear that if you use one of umbreon's moves you can catch them eventually.

Abra is very tough to catch.
Chansey and Tauros were very hard to find and catch in Red/Blue/FireRed/LeafGreen. Cresselia is annoying to catch (haven't caught yet, even though it's at 1 HP and paralyzed)
ANy Pokemon that constantly uses Recover.
Feebas and Magikarp, Magikarp for being nearly useless and Feebas for being nearly useless AND very difficult to find.
Any opponent's Ninjask for being the fastest Pokemon (excluding legendaries).
Bidoof for being just plain annoying to even look at .
SNORLAX

That's what I hate

i cant belive no one has said geodude. it seems like he appers evry 3 steps in a cave. i hate any pokemon that has the move splash in its move set. zubat is practicly worthless untill it evolves into golbat. so it annoys me in caves to. i hate bedoof. its a stupid and poitless pokemon. tentalcool, ugg dont een get me started on how much i despize it for jist existing. it looks wierd, its a crappy battler, and it showes up all the time. i dont like regigigas, they should make it easyer to get. i really love mew... but it is impossible to get so that makes me angry at game freak. and in my crystal game whindy was next to impossible to beat. so she makesme hate milktank to. i hate spiders, so i also hate spinerak or however you spell it. ialso hate the new 5th generation bird it gist looks funny. i coul dubble or triple this list but that requiers to much typing.

Abra and Magikarp pisses me of. Magikarp is useless until it evolves into Gyrados. Abra is hard to catch if it keeps on teleporting.

Worst pokemon ever
Magikarp
Worst pokemon owned by a trainer:
1.The fisherman in D/P/P. He had 6 magikarp that only had the move splash.
2.Number 2 is tied between Lance's Dragonite(in pokemon hg/ss), and Cynthia's Togekiss. They can defeat my team in a minute.
3.Whitney's Evil Milktank(HG/SS) and Cynthia's Garchomp. Without finding a good way to defeat them, my life wuld be horrible.
4. Falkner's pigey in pokemon silver. Mudslap keeps killing me or make my cyndaquil miss on every turn.

1. Bellsprout - when I was leveling my vulpix in Celadon Gym all the Bellsrout would use STUN SPORE than WRAP, or sometimes poision powder.

2. Clair's Kingdra - one weakness Hydro Pump, Dragon Pulse.

3. Chuck's Poliwhirl (HG/SS) - Hypnosis then... FOCOUS PUNCH!!!... RIGHT TO THE FACE!!!

4. Runner(Mespirit etc.) - don't we all hate them?

5. Typhlosion (HG/SS only) - It's move pool is way to small! it's only good moves are Flamethrower, (Eruption), Swift, Extrasensory (egg move)

6. Lance's Gyrados - on the rematch with Lance my Alakazam's Charge Beam was not enough to K.O. it so it wound up sweeping my whole team.... that's the power of the legendary PSYICAL SPECIAL SPLIT!!!

7. Bastiodon - HIT HARDER YOU STUPID PUG!!

8. Moltres - GET IN THE BALL! [for more information use following link] http://www.youtube.com/watch?v=GXUyQVf_Yh4

Whitney's Miltank never gave me any trouble, nor Morty's Gengar.

ME : I hated Koffing, Weezing, Voltorb, Electrode and anything else that can use self-destruct. That move is friggin irritating. Though it is pretty funny when a Rocket makes their pokemon use it when it's the only pokemon they have.

My boyfriend hates Noctowl just because he ran into a shiney Swinub while his Noctowl was at the front of the party. He tried to weaken it but his Noctowl got a critical hit and fainted it. So he fainted the Noctowl and then released it. lol

The pokemon that pissed me off the most was Walace's Ludicolo, always using Double Team on my Swampert, and then using Giga Drain, and at the time when I played that game, I thought there was a I in "team", so I only had a Swampert, and a whole lot of HM slaves.

The Pokemon that p***ed me off the most have to be Pokemon that use moves like sand-attack and harshly lower down your accuracy! I hate that because I can never hit them and even If I switch Pokemon they will use the same freakin' move!

Lets not forget Ho-Oh..
I have a Ho-Oh now, and it PWNS in my HG, but it was LEVEL 45, and at like, the crack of night, I had it weakened down to full health, and I threw ALL my dusk balls, but it kept failing. I soon just gave up and used my Master Ball, stupid bird..

pacceba : 1. Flannery's torkoal,
2. Skitty
3. Oddish
4. Pidgey
5. Any pokemon knowing sand attack, or double team.
6. Any pikachu another trainer has.
7. Gen 4 and past.

Whitney's Miltank- Milk Drink+ Rollout destroyed me many times but i found the flinch-hax from Croconaw's Bite to work well.

Morty's Gengar- Dream Eater+ Hypnosis kinda threw me off, but this is much easier than Miltank simply because Gengar has much lower defensive stats.

Magikarp- It just sucks. Even the pokedex called it the weakest ever.

Pokemon with the ability Poison Point- The problem with that it isn't only physical moves, its any move, so i keep getting poisoned alot.

Zubat- I'm tired of his ugly face being the only thing i see the majority of the time in caves.

Yoshi123 : Zapdos because my brother's encounter with it ended up shiny, and Clair's Dragonairs and kindra

The pokemon that pissed me off the most were AZELF UXIE AND MESPIRIT I used up every ultra ball and great ball on Azelf and then i caught it with a poke ball i used my master ball on Mespirit and I just knocked out Uxie

garitina from pokemon pearl i caught palkia with the master ball so i had to use ultra balls wich was hard enough

Magikarp. Sure, it's easy to beat, but it gives off like no experience. If I'm trying to train a Grass Type Pokemon I go to the ocean or a lake. But I just run into Magikarp, so I have to beat like 100 of them to level up.

Spiritomb always pissed me off. You have to do so much to get it in the games, and Cynthia has one when you fight her. Spiritomb is a ghost-type, and I always battle with as many psychic types as possible, so whenever I try to fight a spiritomb I'm wiped out almost immediately. Beating Cynthia took me like 5 tries.