A lot of Pokemon Trainers have one. There's always that one Pokemon belonging to that one trainer somewhere that he/she detests for being a particular pain in the butt and preventing him/her from achieving an otherwise casualty-free victory. It might be an AI opponent, or a Pokemon lovingly trained by someone else on Wi-Fi; and so the question is: Who/what was the one Pokemon that was the most difficult for you to defeat? The Pokemon in question can be from any of the main game series, and it can be a Pokemon that was either wild, controlled by a computer NPC, or trained by someone in a linked battle, but was there ever a single Pokemon you disliked because it just wouldn't go down without murdering at least half your team first? For instance in Unova, I can think of two particular Pokemon that fit this bill to a T. The first is Ghetsis' Hydreigon. When the battle started, I was pretty confident. My Pokemon were very high-levelled and were pretty much destroying Ghetsis' team. And then, Hydreigon shows up. At first, I tried sending out Reshiram in an attempt to take it out with Dragonbreath. The poor dragon goes down with Hydrei's Dragon Pulse. Without a second though, I then sent out my Crustle, hoping that it had the defenses to shirk off whatever attack was coming and counter it with X-Scissor, but then it, too goes down with a single Surf attack from Hydrei., around 5 Pokemon and numerous revives later, the beast finally went down with a combined effort from everyone...and still, there was Ghetsis' Eelektros to contend with. Feck. Ever since then (and beating the game) I swapped everyone for their EV-trained counterparts, Pokemon specifically chosen and trained to realize their full potential. There was still one more person in all of Unova that stood between me and the title of 'strongest in Unova' and that person was staying in a Villa in Undella town, waiting to sweep me off my feet with her piano theme and destroy my hopes and dreams. I was very wary of Cynthia. I fought her before in Platinum and Diamond, and she was one of the most intelligent AI opponents in the game, and so I took my time and picked off her team one by one. With only two left on her side and me with a full team, I was sure that the worst was already behind me. And then it came. Swiftly it rose to the opposition, its wing-fin-blade things stretched out and ready for battle. The single most horrifying creature to ever walk on Unova's ground. That fucking Garchomp. In little to no time at all, it was the Hydreigon nightmare all over again. My entire team compltely demolished by the demonic land shark. My Simipour was the first to go. I thought she was fast enough. I thought she could get in an Ice Beam and end it all. I was wrong; so terribly wrong. And so with nothing but my crustle left, I thought I was doomed. But miracle of miracles, I still had one shot. It was probably the worst strategy ever, but it was the only one I had left. You see, Crustle was tough. I mean, really tough. My team was made of things with obscene amounts of defense and HP, but Crustle was special. Crustle didn't get KO'd in one turn. What's more, he had a rocky helmet equipped, which managed to take a small chunk out of Garchomp's HP. That was it, that was all I had to do. I just had to keep healing Crustle, and let Garchomp attempt to take it out with all the strongest attacks at its disposal, and after which Crustle just heals right back up, with full HP. Meanwhile, Garchomp's HP is eventually whittled down to almost nothing with residual damage from Rocky Helmet. And with one final X-Scissor, the thing went down. It was a victory, but it felt like the worst victory ever for me. My team was mostly dead, and I won by a really cheapass strategy. So for now, I train; for now, I wait. It'll be Spring in two months, and Cynthia will be back, and then I will defeat her once more, with an actual strategy D=< So yeah, those were my two Toughest Pokemon Opponents Ever, who were yours?