>>33688237>TropiusIt's large, yes, bit it really only needs watering and sunlight and in exchange you get a friend, snacks, and flying transport.
>Many grass types in generalThe hardest part of dealing with some pokemon is feeding them. So long as you have water, sun, and dirt, most grass types will do fine. Not all, some specifically need more, or have other problems, but throwing a dart at a random grass type isn't a bad way to go.
>Misdreavus, and other "benign" ghost typesStuff like Ghastly or things that eat spirit are probably out. Benign ghosts can basically violate the laws of thermodynamics, which is great for the wallet, and you get a friend with cool powers.
>SlowpokeLow maintenance as far as water-types go, cuddly, and has a few neat abilities. Unlikely to harm itself.
>ChanseyProbably difficult to get, but it is a natural born companion, doesn't seem to have that stringent of upkeep requirements, and while certainly fat, it probably eats less than a standard human would. Even one of those eggs it allegedly produces would easily make this worth it.
>AriadosIf you can get past the whole "Spider measured in feet" thing, Ariados has literally hundreds of practical applications thanks to its webbing, and as a bonus, it will basically ensure no other bugs make it into your house. Or mice. Or cats. It also has low-key psychic powers, so that might be fun. Beware of its poison.
>Small normal typesI mean, they make good pets, but not great. Why not just get a dog at this point?
>AggronFeeding it is an absolute bitch, make no mistake, but if you can, you get a literal paradise for a backyard. You could easily get into real estate and flip houses by letting Aggron do some landscaping to pay for the tons of scrap metal you are going to need to source.
Another upside, recycling is now much, much easier.