I had trouble catching Latios because every time i found him i was never prepared and the weakest part was that in the game they never gave me a master ball that made it so much harder.

The most annoying pokemon to catch for me was Entei in Pokemon Crystal every time i went near it it ran somewhere else it was REALLY ANNOYING and iv still not caught it.

superscyth09 : heres a tip make sure you are inbetween a town and a route ( most likely new bark town and the first roue you go on) MAKE sure you get a lot of max repels and run back and forth check your map and if its on a close route like the one with the edges so you cant get pass and if its one of those places put on a max repell and you will find plus have a pokemon hat has mean look repet till you catch them

I think that a really annoying pokemon to catch would be chansey in the safari zone. They like would have u use 10 safari balls and still wouldn't get captured and flee when you are just about all out of balls.

(Not inculding legendary pokemon)To me beldum has been the hardest to catch,so hard to catch that I had to experiment with different pokeballs but when I caught it I went hyper!

The hardest Pokemon for me to catch is Rayquaza on Emerald. It took me a while to catch it because my Pokemon weren't high leveled and because he kept on breaking free of my balls. I finally caught him with a great ball.

Well, lots of Pokemon were hard for me to catch, but one that strikes me when I think of them is Kyurem (B&W). At the time, I only had 20 Pokeballs and nothing else. Half of my Pokemon were KO'd, Victini the only one at near full health of the ones up and going. At that time I knew Kyurem had a catch rate of 3, so I bought a few Ultraballs, but I used them all on a Ditto so I can trade for a Rotom. I didn't feel like going back, so I went ahead. I'll skip a few things to when I was catching it. So I used False Swipe (caught a Zangoose) on him, so I figured Pokeball time. It took me 19 times before SOMEHOW it caught it. Here is a trick for catching Pokemon on DS games: See the Pokeball on the touch screen? When you select a ball, wait for it to hit. As soon as you see the ball hit the wild Pokemon, start circling the ball on the touch screen. It makes it much easier to catch.

Latios. I hated that thing. I spent hours trying to catch that bas...but then I got Emerald. In that one I actually remembered to get the Master Ball and voila, I caught it (though it wasn't as satisfying).

Galacta : sorry but theres is no way to make catching a pokemon eaiser it was luck

I think that lotios is the hardest pokemon to catch. If you don't have a masterball. Well any legendary that your trying to catch and you don't have a masterball will be hard.

There have only been two Pokemon that ever gave me trouble while trying to catch them. The first was Latios, which I used False Swipe to bring down to 1 HP, then I used a Gengar on the next encounter for Mean Look/Hypnosis at Night and started lobbing Dusk Balls at it. It took ALL 50 Dusk Balls, AND about 40 of my Ultra Balls. I hated that thing...

The second worst Pokemon for me to capture was a wild Metang in Pokemon White. I weakened it and paralyzed it like I normally do, and ended up losing OVER 90,000 worth of various kinds of Pokeballs on the thing... I was about ready to throw the DS out the window. I'm glad it had an Adamant nature and decent IVs, or I would have been REALLY po'd...

I guess the games' just paying me back for getting an average of 4 legendary Pokemon per game file on my first Dusk Ball.

Rayquaza in HGSS is insanity. It knows outrage. yeah. it kills itself. A LOT.

Latias was probably the worst for me. They can be a pain, but I do enjoy hunting down the Legendary Pokémon that run around in Gen II and III. After I see one of them for the first time, I start training a particular Pokémon to catch my target. I always get them eventually.

Mewtwo was probably one of the easiest difficult catches. On my old Pokémon Red cartridge, I spent a few hours lobbing Pokéballs and watching it kill itself with Struggle repeatedly. I saved right before the battle, so I could start over whenever it died. Eventually I was in a battle and got it down to half health and paralyzed. I was tired of investing my life savings worth of Pokéballs into it, so I just started tossing out regular Pokéballs. Miraculously, one of them worked. Now it's Level 100 and godly. I literally owned the R2 Master Prime Cup in Stadium 1.

I think Mew or Mewtwo would be the hardest pokemon to catch, because they are pretty powerful and it takes forever to catch them!

FFFighterDill : All right then, try it. Makes life easier. And, plus, that wasn't the only time it worked for me. I've been using that trick since D/P/Pt. Worked the first time QUICK BALL Mesprit with full health and no status alignments (Correct me if that's a typo).

Most legendaries I have caught within 10 Ultra/Dusk Balls depending on the Generation. It has never been hard for me cause I go in with Pokemon that are either overlevelled or resist it.

The hardest one though was a wild Dragonite I fished up, for some reason not a single ball worked on it until 60 Dusk Balls, 40 Ultra Balls, and 10 Dive Balls later I caught it

WarpStarFerret : I hated chasing he 3 dgos, and Laotios/Latias. I would also have to agree about how Chansey in safari zone flee's while at the same time wastes all your safari balls. Its nice to chance catching it in one.
Warp: Does nature mater?

UserMike : Nature only matters if you plan to battle with the pokemon you catch, it makes no difference in actually catching them.

To add to the thread...

Feebas in 3rd and 4th gen was a nightmare to catch mainly due to how absurdly hard it was to encounter. In 3rd gen, you had to fish from one of six possible tiles in the entire game that Feebas could be found at, and in 4th gen that number was reduced to four spots that changed daily. Fun.

Galacta : well i have a ds and a dsi but i lost p/pt so i cant find that out yet till i find one of them or i get black version

The hardest pokemon to catch are the three legendary beast, or any other pokemon similar to them( latios, latias). First off, the legendary pokemon can flee from you easily if they are faster than you. Even if you use mean look, they still know the move roar, so they can just use it and the pokemon will escape( one major difference between the legendary beast and latios and latias).