Impossible GTS trades and the fact that even with a status condition and 1 hp, the Regis like making my inventory eat over 120 Ultra Balls in Sapphire.
I totally agree with you there. I hate it when people ask for legendaries or level 100 Pokemon or something really rare in exchange for something really common (i.e. they want your Spiritomb for their Gothita). It's why whenever I want to do a GTS trade, I offer up the Pokemon myself rather than look at what offers are already out there.
Other Pokeproblems I have:
- I see a shaking patch of grass. Ooh, an Audino! Gah, it's an Emolga instead.
- I see a shaking patch of grass. Ooh, an Audino! I'll use a Pokemon I'm having a really hard time training. What, my Pokemon fainted against it? There goes lots of potential XP gained...
- Stupid wild Zebstrikas who use Pursuit on the Pokemon I'm trying to switch out and protect. (Especially if said Pokemon is Ghost or Psychic-type.)
- The Castelia Sewers contain predominantly Zubat and Rattata--why'd they have to bring that much-loathed Pokemon combo back?
- Playing the older Pokemon games again and having to choose carefully who to use a TM on. The fifth generation has spoiled me with its unlimited-use TM's.
- I accidentally KO the Pokemon I'm trying to catch with a critical hit (happened to me with a Castform in Black 2)
- The Pokemon I'm trying to catch uses Roar, Whirlwind, Teleport, Memento, Selfdestruct, etc. (happened to me with a shiny Lairon)
- Trainers in Black 2 challenge me to triple/rotation battles when I'm totally not prepared for them
- I don't have enough evolution stones to evolve all the Pokemon I want to (happening to me with Dusk Stones in Black 2)
- The antique shop in Join Avenue sells me their fiftieth Hard Stone
- I can't sell more than one item at a time to item maniacs (took me forever to sell those 50 Honeys to the food maniac in Black 2)
- No daycare available before beating the champion in Black 2/White 2