Monster Hunter Trouble

I have a similar problem in Pokémon: I spend all my money on Pokéballs, so I can´t buy medicine for my Pokémon. I mean, I just need to get them back on their legs again, since I got enough berries, but yeah.

Also, why can´t there be a super rare berry that grows infuriatingly slow and gives somewhere between 2-4 berries when harvested, but therefore it gets your Pokémon going again?

Within a week I´d have 999 of those.