>>57325487>CastformObviously being able to use Rain Dance or Sunny Day whenever you need to would be perfect.
>DiglettOthers have already said this for its Silver dex entry "If a Diglett Digs through a field, it leaves the soil perfectly tilled and ideal for planting crops." But also in Stadium 2 it has "If a Diglett Digs through a field, it leaves the soil perfectly tilled and ideal for planting crops."
>VenonatIt eats hunts small insects to eat, like pests and crop killers. You'll need something to take care of this, since you can't spray pesticides with pokemon helpers wandering around. Venonat does ooze poison from all over its body though, so you'll want to pair it with a-
>PyukumukuThey learn Purify, theyre the only pokemon that learn it. Purify will help keep the Venomat in balance with your farm.
After that you probably want a hauling mon and a harvesting mon depending on which crop you grow, but there's no specific mom suited to that. This was a fun thought exercise.