As far as unloved, how about Ditto? Basically, they are kidnapped from their habbitat's and taken to an old man's house and forced to ***** to 100s-1000s of Pokemon ranging from creatures made of blades or flames to giant spiders and literal bags of garbage. It's forced to sleep with both genders, and usually it's own children and grandchildren. When we aren't forcing it to mate with everything imagineable, we keep it locked away in the PC never to see sunlight, unless it's breeding. We give it no thanks, no nice items no nothing. Go ahead, take your Ditto from thePC/Daycare right now and go check what it's happiness is. Ditto is the backbone of any good trainer's team in a behind the scenes sense and really makes it possible to get those specific Pokemon that you love. But do you ever say thank you? No! You just say, "You worthless Ditto, you don't have enough good IVs". Ditto get's treated worse than an HM slave.