here to punch your feels

Eevee, by default would boost your social interactions and help till soil, but not long after the start it would evolve, each one offers a unique perk:

Flareon, discourages pests, you can farm naturally in winter

Jolteon, prevents lightning strikes to crops, discourages pests

Vaporeon, helps water crops, helps with fishing

Espeon, helps with chores, gives forecast for the weather

Umbreon, discourages pests, helps with catching pokemon you are trying to catch

Leafeon, speeds up the growth of crops, increases quality of crops quicker

Glaceon, helps water crops, freezes water to allow crossing (temp)

Sylveon, boosts your social interactions, you make more money on what you sell

Yamper and Purrloin

Yamper, discourages pests, helps with tilling soil

Purrloin, brings you items it "found", boosts social interactions

Furfrou, each "form" of Furfrou offers a unique perk, unlike the rest, you can change this up at any time and have a different perk

Natural, helps with catching pokemon you are trying to catch

Heart, increase success when flirting

Star, boosts your luck in what you find while exploring

Diamond, boosts the money you make from what you sell

Debutante, more likely to see discounts/increase bartering

Matron, discourages pests

Dandy, boosts your social interactions

Le Reine, more likely to experience rain

Kabuki, increases your fishing and bug catching chances

Pharaoh, increases crop quality faster

Bulbasaur, Fennekin, Mudkip

Bulbasaur, helps crops grow, increase crop quality, evolved discourages pests

Fennekin, helps gather items on walks, allows you to farm naturally in winter, evolved able to help with chores

Mudkip, helps water crops, helps till the soil, evolved you can surf on it

Buneary and Riolu

Buneary, helps till the soil, boosts your social interactions

Riolu, discourages pests, helps clear out obstacles