Just another pokemon player.
Version exclusive Pokémon were already enough for people to trade. Trade evolutions have become a real pain, because you need to organise a meeting so you can trade to evolve and trade back to get your new Pokémon. With breeding, natures, abilities and whatnot, people don't want to be trading over and over just to get "the perfect specimen".
And pokemons like shelmet and karrablast evolutions are also really annoying to finish both entries
One recent thing is really grinding my gears is how absurd the ammount of needed ultra sun pokemon, are transfer only. What i mean is pokemon from several generations including generation 2, 4 and 5 being the worst culprits. A lot these generations are not included in the main game.
People who don't use poke bank since i don't have any nintendo ds models that possess cartridge ports for Game Boy for complex transfers and many DS pokemon games can't be found since our only second hand game store focuses on PS3 and PS4
This means i have to slowly use the GTS system to fill over 500 pokemon not in Ultra Sun (not counting legendaries). I did Guzzlord as part of this since Guzzlord level 4 portals are hard to get, he has a absurdly low encounter in these portals and Guzzlord has one of the lowest catch rates.