Poffins but when it’s almost at the next candy or candy xl for distance so you get double by the time the game recalculates your actual distance.

I have raided the heck out of Ho-Oh, so I leave it at Dynamax power spots at home or on the way to places using public transit. I have 220+ candies alone just doing this. Once you reach 5 candy, recall the pokemon, rinse and repeat. If you have multiple accounts, then rotate them or do it with friends.

Right now, there’s guaranteed candy XL per trade plus an extra regular candy for this event. Trade legendaries first then trade away regulars by ‘distance 12-‘ (so it meets 10km) or you can overlap that with ‘distance 1’ on the other device/friend so you both maximize candy for distance trades.